JP3394329B2 - Eavesdropping prevention method for facsimile modem and facsimile machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eavesdropping prevention system for a facsimile modem and a facsimile apparatus, and particularly to a recommendation pattern corresponding to a bit group and a phase change amount established based on the recommendation, and avoiding the recommendation pattern. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiretapping prevention system for a facsimile modem having a plurality of non-recommended patterns and a facsimile machine.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus using a modem compliant with CCITT recommendation has not been encrypted for data communication, and therefore a facsimile signal may be illegally received by eavesdropping. In particular, in recent years, portable facsimile devices have begun to be used, and eavesdropping problems have occurred in facsimile communication using wireless lines.

With respect to the problem of wiretapping in such facsimile communication, JP-A-3-293834 aims to prevent wiretapping.
The "eavesdropping prevention method for facsimile communication" described in Japanese Patent Publication is reported. This is encoded in the cryptographic parameter /
Corresponds to the decoding method and decides the encoding / decoding method based on the command from the receiving station. Also, it corresponds to multiple transmission rates to the encryption parameter and changes the transmission rate for each communication. is there.

[0004]

However, in the conventional "eavesdropping prevention method for facsimile communication", the transmission speed of communication is changed by associating a plurality of encoding / decoding methods and transmission speeds with encryption parameters. Since it is changed, even if the highest transmission speed can be used, the communication speed will be wasted more than necessary by using the low transmission speed, and the communication cost will increase. was there.

Therefore, according to the present invention, the same non-recommendation pattern is set in the pattern tables of the modem units of the own facsimile device and the partner facsimile device, encrypted facsimile communication can be performed, and a facsimile signal is illegally received by eavesdropping or the like. It is an object of the present invention to provide a facsimile apparatus that can prevent such a situation and improve the convenience of the user.

[0006]

The invention according to claim 1 is
In order to solve the above problems, after dividing communication data into bit groups, a signal point is generated based on a phase change amount corresponding to each bit group, and a bit group corresponding to the phase change amount of the signal point is generated. In the wiretapping prevention method of a facsimile modem that converts and generates communication data,
The present invention is characterized in that it has a recommendation pattern corresponding to a bit group and a phase change amount that are established based on the recommendation, and has a plurality of non-recommendation patterns that avoid the recommendation pattern.

In order to solve the above-mentioned problems, the invention according to claim 2 is based on a non-standard function identification signal NSF received from a partner facsimile machine via a communication line in the wiretapping prevention system of the facsimile modem according to claim 1. When the partner facsimile machine does not have the non-recommendation pattern, the recommendation pattern is set.

In order to solve the above-mentioned problems, the invention according to claim 3 is based on the nonstandard function identification signal NSF received from the partner facsimile machine via the communication line in the wiretapping prevention system of the facsimile modem according to claim 1. If the partner facsimile machine has the non-recommendation pattern, the non-recommendation pattern is set.

In order to solve the above-mentioned problems, the invention according to claim 4 provides a recommendation pattern corresponding to a bit group and a phase change amount established based on the recommendation, and a plurality of non-recommendation patterns avoiding the recommendation pattern. A pattern number is set in the pattern storage means for storing, a protocol signal communication means for communicating a protocol signal with a partner facsimile machine via a communication line, and a non-standard function identification signal NSF received by the protocol signal communication means. In this case, a pattern selection unit that selects a non-recommended pattern that matches the pattern number from the non-recommended patterns stored in the pattern storage unit, and a pattern table that sets the non-recommended pattern selected by the pattern selection unit. And a modem means having the same.

In order to solve the above-mentioned problems, the invention according to claim 5 provides a recommendation pattern corresponding to a bit group and a phase change amount established based on the recommendation, and a plurality of non-recommendation patterns avoiding the recommendation pattern. Pattern storage means to be stored, input means for inputting the terminal number of the partner facsimile machine and a personal identification number corresponding to the terminal number, and arithmetic operation for performing a specific arithmetic processing based on the input personal identification number to obtain an arithmetic result Means, a pattern number of a non-recommended pattern based on the calculation result, and a password information storage means for storing the pattern number and the terminal number of the facsimile apparatus of the other party in correspondence with the password, and via a communication line. When a personal identification number is input by the input means when starting communication with the partner facsimile machine, it is stored in the personal identification information storage means. Network calling means for making a call to the network based on the terminal number of the facsimile machine of the other party corresponding to the secret code, and the pattern based on the pattern number corresponding to the secret code stored in the secret code storage means. Modem means having a pattern table for setting the non-recommended pattern stored in the storage means.

According to a sixth aspect of the present invention, in order to solve the above-mentioned problems, the facsimile apparatus according to the fifth aspect includes protocol signal communication means for communicating a protocol signal with a partner facsimile apparatus via a communication line. In the case of starting communication with the facsimile machine of the other party and registering the pattern number corresponding to the personal identification number in the facsimile machine of the other party, after making a call by the network calling means and connecting to the facsimile machine of the other party, protocol signal communication is performed. Means to set the non-standard function setting signal NSS to the other party's personal identification number and transmit it, and after transmitting the other party's personal identification number, the protocol signal communication means sets the own terminal number to the transmission terminal identification signal TSI and transmits it. Characterize.

In order to solve the above-mentioned problems, an invention according to claim 7 provides a recommendation pattern corresponding to a bit group and a phase change amount established based on a recommendation, and a plurality of non-recommendation patterns avoiding the recommendation pattern. Pattern storage means for storing, protocol signal communication means for communicating a protocol signal with a partner facsimile machine via a communication line, and the protocol signal communication means setting and transmitting that the partner facsimile machine has a plurality of non-recommended patterns After that, when the personal identification number set in the non-standard function setting signal NSS is received from the partner facsimile machine by the protocol signal communication means, a specific calculation is performed based on the personal identification number set in the non-standard function setting signal NSS. An arithmetic means for performing processing to obtain an arithmetic result, and a partner facsimile by the protocol signal communication means When the partner terminal number is set in the transmitting terminal identification signal TSI from the device, the pattern number of the non-recommended pattern is determined in correspondence with the calculation result, and the pattern number and the partner facsimile machine are associated with the secret code. And a personal identification information storage unit for storing the terminal number of.

According to an eighth aspect of the present invention, in order to solve the above-mentioned problems, in the facsimile apparatus according to the seventh aspect, when the communication with the partner facsimile apparatus is started via the communication line, the transmission is performed by the protocol signal communication means. When the partner terminal number set in the terminal identification signal TSI matches the terminal number stored in the personal identification information storage means, the partner facsimile machine corresponding to the partner terminal number stored in the personal identification information storage means Modem means having a pattern table for setting the non-recommended pattern stored in the pattern storage means based on the pattern number.

In order to solve the above-mentioned problems, the invention according to claim 9 inputs to the network based on the input means for inputting the terminal number of the facsimile apparatus of the other party who communicates via the communication line. A network calling means for calling, a random number generating means for generating a random number pattern of a plurality of bit groups when communicating with the other facsimile machine for the first time, and the terminal number input with the generated random number pattern by the input means. Pattern information storage means for storing in correspondence with,
Modem means having a pattern table for reading out the random number pattern corresponding to the terminal number stored in the pattern information storage means and setting the random number pattern.

According to a tenth aspect of the present invention, in order to solve the above-mentioned problems, in a facsimile apparatus according to the ninth aspect,
A protocol signal communication unit for communicating a protocol signal with a facsimile machine of the other party through a communication line is provided, and after the random number generation unit generates a random number pattern, the generated random number pattern is set in the non-standard function setting signal NSS. The protocol signal communication means transmits to the partner facsimile machine, the own terminal number is set in the transmission terminal identification signal TSI and the protocol signal communication means transmits to the partner facsimile machine.

According to an eleventh aspect of the present invention, in order to solve the above-mentioned problems, in a facsimile apparatus according to the ninth aspect,
When the terminal number input by the input means is already stored in the pattern information storage means, the random number pattern stored in the pattern information storage means is read out based on the terminal number, and the random number pattern is stored in the pattern information storage means. It is characterized in that it is set in the pattern table of the modem means.

In order to solve the above-mentioned problems, a twelfth aspect of the present invention solves the above-mentioned problems by a protocol signal communication means for communicating a protocol signal with a facsimile machine of the other party through a communication line, and a transmission terminal identification received by the protocol signal communication means. When communicating with the facsimile machine for the first time based on the partner terminal number set in the signal TSI, the random number pattern set in the non-standard function setting signal NSS received by the protocol signal communication means corresponds to the partner terminal number. And a pattern information storage means for storing the pattern information storage means and a modem means having a pattern table for reading the random number pattern corresponding to the partner terminal number stored in the pattern information storage means and setting the random number pattern. And a facsimile machine.

In order to solve the above-mentioned problems, the invention according to claim 13 is such that, in the facsimile apparatus according to claim 12, the partner terminal number set in the transmission terminal identification signal TSI received by the protocol signal communication means has already been set. When stored in the pattern information storage means, the random number pattern stored in the pattern information storage means is read out based on the partner terminal number, and the random number pattern is set in the pattern table of the modem means. Characterize.

In order to solve the above-mentioned problems, the invention according to claim 14 causes a predetermined sequence of numbers to be calculated based on a predetermined calculation process when the communication with the partner facsimile machine is started for the first time through the communication line. A first arithmetic means for obtaining a first numerical sequence; a numerical sequence storage means for storing the first numerical sequence calculated by the first arithmetic means; To start communication,
Second arithmetic means for operating the number sequence stored in the number sequence storage means based on the predetermined arithmetic processing to obtain a number sequence;
A sequence updating means for updating and storing the sequence of results calculated by the second computing means in the sequence storage means; and a pattern table for setting the sequence stored in the sequence storage means as a pattern of a plurality of bit groups. And a modem means having the same.

[0020]

According to the first aspect of the invention, the RAM section has a recommendation pattern corresponding to the bit group and the amount of phase change established based on the recommendation, and the ROM section has a plurality of non-recommendation patterns avoiding the recommendation pattern. Configure to have. Therefore, the data communication can be encrypted and the illegal reception of the facsimile signal due to eavesdropping or the like can be prevented.

According to the invention of claim 2, in addition to the operation of claim 1, the partner facsimile machine has a non-recommended pattern based on the non-standard function identification signal NSF received from the partner facsimile machine via the communication line. Otherwise, the recommendation pattern stored in the ROM section is set in the modem section. Therefore, it is possible to perform data communication with a general non-encrypted data communication terminal and improve user convenience.

According to the invention of claim 3, in addition to the operation of claim 1, the partner facsimile machine has a non-recommended pattern based on the non-standard function identification signal NSF received from the partner facsimile machine through the communication line. in case of,
The non-recommendation pattern stored in the ROM section is set in the modem section. Therefore, the data communication can be encrypted and the illegal reception of the facsimile signal due to eavesdropping or the like can be prevented.

According to another aspect of the invention, the ROM section stores the recommendation pattern corresponding to the bit group and the phase change amount established based on the recommendation, and a plurality of non-recommendation patterns avoiding the recommendation pattern. On the other hand, based on the pattern number set in the non-standard function identification signal NSF received by the modem section, the system control section selects the corresponding non-recommendation pattern from the plurality of non-recommendation patterns stored in the ROM section. Set on the table. Therefore, the facsimile communication can be encrypted, and the facsimile signal can be prevented from being illegally received by eavesdropping or the like, and the convenience of the user can be improved.

According to the invention of claim 5, the ROM section stores a recommendation pattern corresponding to a bit group and a phase change amount that are established based on the recommendation, and a plurality of non-recommendation patterns that avoid the recommendation pattern. Here, the operation display unit inputs the terminal number of the partner facsimile machine and the personal identification number corresponding to this terminal number, and the system control unit performs a specific arithmetic processing based on the input personal identification number to obtain the arithmetic result. Next, the pattern number of the non-recommended pattern is determined based on the result of this calculation, and the pattern number and the terminal number of the partner facsimile machine are RA-corresponding to the personal identification number.
Store in M part.

On the other hand, when the personal identification number is input on the operation display unit when starting communication with the other facsimile device via the communication line, the other facsimile device corresponding to the personal identification number stored in the RAM unit is input. A call is made to the network based on the terminal number, and then the non-recommendation pattern stored in the ROM section is set in the pattern table of the modem section based on the pattern number corresponding to the personal identification number stored in the RAM section. Therefore, the facsimile communication can be encrypted, and the facsimile signal can be prevented from being illegally received by eavesdropping or the like, and the convenience of the user can be improved.

According to the invention of claim 6, in addition to the operation of claim 5, communication with the partner facsimile machine is started,
When the pattern number corresponding to the personal identification number is registered in the other party's facsimile device, the other party's personal identification number is set in the non-standard function setting signal NSS in the modem part after calling the network control unit to connect to the other party's facsimile device. Send. Next, after transmitting the other party's personal identification number, the modem unit sets the own terminal number in the transmitting terminal identification signal TSI and transmits it. Therefore, since the other party's personal identification number is set to the non-standard function setting signal NSS and transmitted to the other party's facsimile apparatus, the same non-recommended pattern based on the calculation result of the own facsimile apparatus is also set to the other party's facsimile apparatus. Thus, the facsimile communication can be encrypted, and it is possible to prevent the facsimile signal from being illegally received by eavesdropping or the like.

According to the seventh aspect of the invention, the ROM section stores the recommendation pattern corresponding to the bit group and the phase change amount that are established based on the recommendation, and a plurality of non-recommendation patterns that avoid the recommendation pattern. Here, after the non-standard function identification signal NSF is set in the modem section to the effect that the partner facsimile apparatus has a plurality of non-recommended patterns and transmitted, the modem section sets the non-standard function setting signal NSS in the partner facsimile apparatus. When the personal identification number is received, the system control unit performs a specific arithmetic processing based on the personal identification number set in the non-standard function setting signal NSS to obtain a calculation result. Next, when the partner terminal number is set in the transmitting terminal identification signal TSI from the partner facsimile machine in the modem section, the pattern number of the non-recommendation pattern is determined in correspondence with this calculation result, and it corresponds to this personal identification number. The pattern number and the terminal number of the facsimile apparatus of the other party are stored in the RAM section. Therefore, since the personal identification number transmitted from the partner facsimile machine is received and the specific facsimile processing is performed in the own facsimile machine, the non-recommendation pattern identical to the non-recommendation pattern obtained in the partner facsimile machine. Can be set in the own facsimile device, the facsimile communication can be encrypted, and the unauthorized reception of the facsimile signal due to eavesdropping or the like can be prevented.

According to the invention described in claim 8, in addition to the operation described in claim 7, when the communication with the partner facsimile machine is started via the communication line, the transmission terminal identification signal TS is transmitted by the modem section.
When the partner terminal number set in I matches the terminal number stored in the RAM section, it is stored in the ROM section based on the pattern number of the partner facsimile machine corresponding to this partner terminal number stored in the RAM section. The set non-recommended pattern is set in the pattern table of the modem section. Therefore, when starting the facsimile reception from the partner facsimile machine via the communication line, if the terminal number of the partner facsimile machine matches the already stored terminal number, based on the pattern number corresponding to this terminal number. By setting the stored non-recommendation pattern in the pattern table of the modem section, encrypted facsimile communication can be performed with the same destination facsimile device, and it is possible to prevent unauthorized reception of facsimile signals due to eavesdropping or the like. The convenience for the user can be improved.

In the ninth aspect of the present invention, the operation display unit inputs the terminal number of the facsimile apparatus of the other party with which the communication is performed via the communication line, and the network control unit calls the network based on the input terminal number. Here, when communicating with the other facsimile machine for the first time, a random number generation unit generates a random number pattern of a plurality of bit groups, and the generated random number pattern is stored in the RAM unit in correspondence with the terminal number input on the operation display unit. Remember. Next, the random number pattern corresponding to this terminal number stored in the RAM section is read out and the random number pattern is set in the pattern table of the modem section. Therefore, by setting a random number pattern of a multi-bit group that avoids the recommendation pattern in the pattern table of the modem unit, it is possible to encrypt the facsimile communication and prevent the facsimile signal from being illegally received by eavesdropping or the like. it can.

According to the tenth aspect of the invention, in addition to the operation of the ninth aspect, after the random number generator generates a random number pattern, the generated random number pattern is used as the non-standard function setting signal NS.
S is set to S and is transmitted to the facsimile machine of the other party by the modem section, and its own terminal number is set to the transmission terminal identification signal TSI and transmitted to the facsimile machine of the other party by the modem section. Therefore, by sending a random number pattern to the other facsimile machine,
The same random number pattern as the random number pattern set in the own facsimile device can also be set in the partner facsimile device to encrypt the facsimile communication, and the facsimile signal can be prevented from being illegally received due to eavesdropping or the like.

According to the eleventh aspect of the invention, in addition to the operation of the ninth aspect, when the terminal number input on the operation display section is already stored in the RAM section, the RAM section is based on this terminal number. Read the random number pattern stored in
Set the random number pattern in the pattern table of the modem section. Therefore, when starting the facsimile transmission to the partner facsimile machine via the communication line, if the input terminal number matches the already stored terminal number, the random number pattern corresponding to this terminal number is stored in the modem section. By setting in the pattern table, encrypted facsimile communication with the same facsimile machine can be performed, and it is possible to prevent the facsimile signal from being illegally received due to eavesdropping or the like, thereby improving the convenience for the user. it can.

According to the twelfth aspect of the present invention, when the first communication is made with the partner facsimile machine based on the partner terminal number set in the transmission terminal identification signal TSI received by the modem part, the non-received part by the modem part is received. Standard function setting signal N
The random number pattern set in SS is stored in the RAM section corresponding to the partner terminal number. Next, the random number pattern corresponding to the partner terminal number stored in the RAM section is read out, and this random number pattern is set in the pattern table of the modem section.
Therefore, by setting the random number pattern received from the partner facsimile machine in the pattern table of the modem section, the same random number pattern as that set in the partner facsimile machine is also set in the own facsimile machine to encrypt the facsimile communication. Therefore, it is possible to prevent the facsimile signal from being illegally received due to eavesdropping or the like.

According to the thirteenth aspect of the invention, in addition to the action of the twelfth aspect, when the partner terminal number set in the transmission terminal identification signal TSI received by the modem section is already stored in the RAM section. , R based on this partner terminal number
The random number pattern stored in the AM section is read and this random number pattern is set in the pattern table of the modem section. Therefore, when starting the facsimile reception from the facsimile machine of the other party through the communication line, if the terminal number of the facsimile machine of the other party matches the already stored terminal number, the random number pattern corresponding to this terminal number is used as the modem section. By setting the same in the pattern table of No. 3, it is possible to perform encrypted facsimile communication with the same facsimile machine, prevent unauthorized reception of facsimile signals due to eavesdropping, etc., and improve user convenience. You can

In the fourteenth aspect of the present invention, when the communication with the facsimile apparatus of the other party is started for the first time through the communication line, the system control unit calculates a predetermined sequence of numbers based on a predetermined calculation process, and the first sequence is executed. A sequence of numbers is obtained and the first sequence of numbers is stored in the RAM section. The first number sequence stored in the RAM section is set in the pattern table of the modem section as a pattern of a plurality of bit groups. On the other hand, when starting the second and subsequent communications with the partner facsimile machine via the communication line, the system control unit operates the number sequence stored in the RAM section based on a predetermined operation process to generate a new number sequence. The obtained and obtained new result sequence is updated and stored in the RAM section. Next, the new number sequence stored in the RAM section is set in the pattern table of the modem section as a pattern of a plurality of bit groups. Therefore, when the communication with the partner facsimile machine is started for the first time via the communication line, a predetermined sequence of numbers is calculated based on a predetermined calculation process to obtain a calculation result, and therefore, the transmission side facsimile machine and the reception side facsimile machine. The same calculation result is obtained without communicating the calculation result with the device. When starting the second and subsequent communications with the partner facsimile machine via the communication line, the stored number sequence is calculated based on a predetermined calculation process to obtain a new number sequence, and this new number sequence is obtained. By setting in the pattern table of the modem as a pattern of multiple bit groups, encrypted facsimile communication can be performed without using the same pattern, and it is possible to prevent unauthorized reception of facsimile signals due to eavesdropping or the like. it can.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a facsimile apparatus 100 according to the present invention. In FIG. 1, the scanner unit 1
Scans a document image optically and converts it into image data. The plotter unit 2 physically records image data on recording paper. The encoding / decoding unit 3 uses the MH system and M
The image data to be transmitted is encoded into image information and the received image information is decoded into the original image data based on an encoding method such as the R method or the MMH method. The modem unit 4 has a pattern table for setting recommended patterns and non-recommended patterns according to the present invention, and modulates and demodulates image information for communication, and also communicates various protocol signals for transmission control. The network control unit 5 is connected to the communication line and the telephone 9 and performs predetermined line control for making and receiving calls. The operation display unit 6 displays the operation state of the facsimile apparatus 100 and inputs various operations by the operator. The system control unit 7 controls each unit of the facsimile apparatus 100 based on a control program and various data stored in a ROM (Read Only Memory) unit 10, and also includes a recommended pattern and a non-recommended pattern used for the modem unit 4. R
Register in the AM section 11. The random number generation unit 8 randomly generates a sequence of random numbers based on activation information based on time information of the clock unit of the system control unit 7. ROM (Read Only
The memory) unit 10 stores a control program and various data. In particular, the ROM unit 10 stores the recommended pattern, the non-recommended pattern, and the like used in the modem unit 4. R
An AM (Random Access Memory) unit 11 includes a non-recommended pattern calculated as a result of the system control unit 7 and a random number generation unit 8
The sequence of random numbers generated in step 2 is stored in the modem unit 4 for use. The system bus 12 is a signal line for exchanging various control signals and various data between the above respective units.

FIG. 2 is a diagram showing an embodiment of the modem section 4 according to the present invention. As shown in FIG. 2, the modem unit 4 is
It is composed of a modem transmitter (a) and a modem receiver (b). In the modem transmission unit (a), the scrambler 21 uses CCITT Recommendation V.3 in order to prevent the modulated output signal from becoming a single sine wave. 27 ter, V.I.
Based on 29, a pseudo random signal is obtained from the original signal.
In addition, V. 27ter is a 4800 / 2400-bit / s standardized modem for the general switched telephone network,
V. 29 is a standardized 9600 bit for dedicated lines
/ S modem. The encoding unit 22 has a pattern table in which a recommended pattern, a non-recommended pattern, and the like can be set by the system control unit 7. The encoding unit 22 converts the input data into a multi-valued number for modulation and groups the individual data. Generate points. The transmission filter 23 performs band limiting processing of the transmission signal. The modulator 24 modulates the transmission signal. The D / A converter 25 converts a digital signal into an analog signal. The output filter 26 removes out-of-band signal components.

In the modem transmitting section (a), the reception filter 31 is a filter for removing noise and the like received by the received signal on the transmission path. The A / D converter 32 converts an analog signal into a digital signal. The AGC 33 makes the signal level of the received signal constant. The demodulation unit 34 demodulates the received signal. The automatic equalizer 35 removes the distortion of the received signal received on the transmission path. Timing playback unit 3
6 synchronizes with the transmission data based on the received signal.
The phase synchronization unit 37 compensates for phase fluctuations and frequency shifts. The determiner 38 determines the transmission data. The error calculation unit 39 calculates the error between the result of determining the actual transmission signal and the ideal value, and feeds it back to the phase synchronization unit 37 and the automatic equalizer 35. The decoding unit 40 has a pattern table in which a recommended pattern, a non-recommended pattern, and the like can be set by the system control unit 7, and converts into a multi-valued number grouped based on signal points.
The descrambler 41 is based on CCITT Recommendation V.50. 27te
r, V. The original signal is obtained from the pseudo-random signal based on 29, and corresponds to the scrambler 21 of the modem transmission unit (a).

FIG. 3 is a diagram showing an embodiment of the relationship between the 3-bit data and the amount of phase change of the modem section 4 according to the present invention. FIG. 3a shows CCITT Recommendation V.6. 27 ter, V.I. Two
It is a figure which shows the relationship of 3-bit data based on 9 and the amount of phase changes. As shown in FIG. 3a, CCITT Recommendation V.5. Two
7 ter, V.I. In normal facsimile communication based on 29, 3-bit data is grouped and modulated or demodulated while having a relationship between the 3-bit data and the amount of phase change. CCITT Recommendation V. 8 at 27ter
Phase-phase modulation (3 bits) is used. On the other hand, CCIT
According to T Recommendation V29, binary amplitude modulation (1 bit) and 8
An amplitude phase modulation method (4 bits) that combines phase and phase modulation (3 bits) is used. Therefore, FIG. 3a and FIG.
The 3-bit data shown in b is related to 8-phase phase modulation.

FIG. 3b shows a third embodiment according to the invention.
It is a figure which shows the relationship between bit data and the amount of phase changes. Figure 3
As shown in b, in facsimile communication that requires encryption, 3-bit data is grouped and modulated or demodulated while having a relationship between the 3-bit data and the amount of phase change. Therefore, when the modulation or demodulation is performed while having the relationship between the 3-bit data and the phase change amount as shown in FIG. 27 ter, V.I. Since there is no reproducibility of modulation / demodulation with an ordinary facsimile device based on No. 29, facsimile communication cannot be performed.

FIG. 4 shows a facsimile apparatus 10 according to the present invention.
It is a figure which shows one Example of the communication protocol of 0. As shown in FIG. 4, as a pre-transmission procedure, the transmission-side facsimile device transmits a ringing tone CNG signal to the reception-side facsimile device through the communication line to originate a call. The receiving side facsimile apparatus transmits the called terminal identification signal CED after detecting the CNG signal. Next, the receiving-side facsimile apparatus indicates that it has a non-recommended pattern, a random number pattern, or a calculation pattern by a non-standard function identification signal NS.
Set to F and send.

In response to this, the transmitting facsimile machine
The fact that the facsimile machine of the other party has the other person's personal identification number or non-recommendation pattern or the use of the random number pattern or the calculation pattern is set in the non-standard function setting signal NSS and transmitted. Then, the own terminal number is set in the transmission terminal identification TSI and the data is transmitted to the facsimile machine of the other party. Next, the sending facsimile machine starts the training check TCF.

Next, the receiving facsimile machine transmits the reception preparation confirmation signal CFR after receiving the training check TCF. The above is the pre-transmission procedure. Next, when the transmission side facsimile device receives the reception preparation confirmation signal CFR, it transmits the information code PIX of the first page of the document. Next, when the transmission of the last page is completed, the transmitting side facsimile device transmits the procedure end signal EOP. Upon receiving the message confirmation signal MCF from the receiving side facsimile apparatus, the transmitting side facsimile apparatus transmits the disconnection command signal DCN to end the communication.

(Embodiment 1) This embodiment (claims 1 to 4) can be applied to the facsimile apparatus described in FIG. In the present embodiment, the characteristic parts of the present invention (claims 1 to 4) will be specifically described. FIG. 5 is a diagram showing a flow chart of the receiving operation of the facsimile apparatus according to the present invention.

In FIG. 5, first, the modem unit 4 receives a protocol signal from the facsimile machine of the other party (process S).
10). Next, the system control unit 7 causes the modem unit 4 to receive the non-standard function identification signal NS received from the partner facsimile machine.
Based on F, it is determined whether the partner facsimile machine has a non-recommended pattern (process S11). Process S11
If the partner facsimile machine has no non-recommended pattern, the system control unit 7 reads the recommended pattern based on the modem recommendation from the ROM unit 10, and the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4 is read. Is set (step S12). Next, CCITT Recommendation V. 27t
er, V.E. Based on 29, communication of image information is started (process S13).

On the other hand, when the partner facsimile machine has the non-recommended pattern, it is judged whether or not the partner facsimile machine has designated the pattern number based on the non-standard function identification signal NSF received from the partner facsimile machine ( Process S14). When the partner facsimile machine does not specify the pattern number, the system control unit 7 reads a specific non-recommended pattern from the ROM unit 10 and sets it in the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4. Yes (process S15). Next, CCITT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (process S13).

On the other hand, when the partner facsimile machine specifies the pattern number, the system control section 7 reads the non-recommended pattern from the ROM section 10 based on the pattern number, and the encoding section 22 and the decoding section of the modem section 4 are read. 40 pattern tables are set (process S16). Then CC
ITT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (process S13).

Thus, in this embodiment (claim 1),
CCITT Recommendation V. 27 ter or V.I. Since the ROM section 10 has a recommended pattern corresponding to a bit group and a phase change amount that are established based on 29, and the ROM section 10 has a plurality of non-recommended patterns that avoid the recommended pattern, Communication can be encrypted,
It is possible to prevent the facsimile signal from being illegally received by eavesdropping or the like.

Further, as described above, the present embodiment (claim 2) is as follows.
Then, based on the non-standard function identification signal NSF received by the modem section 4 from the partner facsimile machine via the communication line, if the partner facsimile machine does not have the non-recommended pattern, the recommendation stored in the ROM section 10 is carried out. Since the pattern is set in the modem unit 4, it is possible to perform data communication with a general non-encrypted data communication terminal and improve user convenience.

Further, as described above, the present embodiment (claim 3) is as follows.
If the partner facsimile machine has a non-recommended pattern based on the non-standard function identification signal NSF received from the partner facsimile machine via the communication line, the ROM
Since the non-recommendation pattern stored in the unit is configured to be set in the modem unit, the data communication can be encrypted and the unauthorized reception of the facsimile signal due to eavesdropping or the like can be prevented.

Further, as described above, the present embodiment (claim 4) is as follows.
Then, the RAM unit 4 uses the CCITT recommendation V.50. 27 ter or V.I. The recommendation pattern corresponding to the bit group and the amount of phase change established based on 29, and a plurality of non-recommendation patterns avoiding the recommendation pattern are stored. On the other hand, based on the pattern number set in the non-standard function identification signal NSF received by the modem section, the system control section 7
Sets a corresponding non-recommendation pattern from the plurality of non-recommendation patterns stored in the ROM section 10 in the pattern table of the modem section 4, so that the facsimile communication can be encrypted.
It is possible to prevent the facsimile signal from being illegally received by eavesdropping or the like, and it is possible to improve the convenience for the user.

(Embodiment 2) This embodiment (claims 5 to 8) can be applied to the facsimile apparatus described in FIG. In the present embodiment, the present invention (claim 5)
The characteristic part of 8) will be specifically described. FIG. 6 is a diagram showing an embodiment of a flow chart for explaining the PIN code registration operation of the facsimile apparatus according to the present invention.

As shown in FIG. 6, in the transmitting side facsimile device for registering the personal identification number, "Do you want to register the partner personal identification number" is displayed on the operation display unit 6 (step S20).
Next, the operator determines whether or not to register the other party's personal identification number from the operation display unit 6 (process S21). When the operator registers the partner identification number from the operation display unit 6, the operator inputs the partner terminal number from the operation display unit 6 (process S22). Next, the operator inputs the other party's personal identification number composed of four digits from the operation display unit 6 (process S).
23). Next, the system control unit 7 calculates the other party's personal identification number based on a specific calculation process, and stores the calculation result in the RAM unit 11 as a two-digit selection number (process S24).

In this particular arithmetic processing, for example, a four-digit number n input from the operation display section 6 is obtained as a two-digit arithmetic result A based on the arithmetic expression f (n). A = f (n) (1) Therefore, the 2-digit arithmetic result A can take 256 kinds of numerical values. Here, 256 types of non-recommendation patterns are R
Since it is stored in the OM unit 10, the pattern number of the non-recommendation pattern and the partner terminal number are registered in the RAM unit 11 in association with the partner password, based on the calculation result A (process S).
25).

Next, in the process S22, the network control unit 5 makes a call to the facsimile machine of the other party based on the input terminal number of the other party (process S26). Next, when the other facsimile machine responds, the system control section 7 causes the non-standard function identification signal N received by the modem section 4 from the other facsimile machine.
Based on the SF, it is determined whether or not the partner facsimile machine has a non-recommended pattern (process S27). When the partner facsimile machine has the non-recommended pattern, the partner secret code number is set in the non-standard function setting signal NSS, and the modem section 4 transmits it to the partner facsimile machine (process S2).
8). Next, the own terminal number is set in the transmission terminal identification TSI and transmitted to the partner facsimile machine (step S28).

Thus, in the present embodiment (claim 5),
The ROM section 10 is a CCITT recommendation V. 27 ter or V.I. The recommendation pattern corresponding to the bit group and the amount of phase change established based on 29, and a plurality of non-recommendation patterns avoiding the recommendation pattern are stored. Here, the operation display unit 6 inputs the terminal number of the partner facsimile machine and the personal identification number corresponding to this terminal number, and the system control unit 7 performs a specific arithmetic processing based on the input personal identification number to obtain the arithmetic result. Ask. Next, the pattern number of the non-recommendation pattern is determined in correspondence with this calculation result, and the pattern number and the terminal number of the partner facsimile machine are stored in the RAM section 11 in correspondence with the personal identification number.

On the other hand, when the personal identification number is input on the operation display unit 6 when starting communication with the other facsimile device via the communication line, the other facsimile device corresponding to the personal identification number stored in the RAM unit 11 is input. The network is called based on the terminal number, and then the non-recommendation pattern stored in the ROM section 10 is set in the pattern table of the modem section 4 based on the pattern number corresponding to the personal identification number stored in the RAM section 11. To do.

Therefore, when the personal identification number is input when starting communication with the other facsimile machine via the communication line, the pattern based on the pattern number corresponding to the personal identification number is stored in the pattern table of the modem section. By setting, it is possible to encrypt the facsimile communication, prevent the facsimile signal from being illegally received due to eavesdropping, etc., and improve the convenience for the user.

Further, as described above, in this embodiment (claim 6)
Then, when communication is started with the facsimile machine of the other party and the pattern number corresponding to the personal identification number is registered in the facsimile machine of the other party, after calling the network control section to connect to the facsimile machine of the other party, the modem section uses a non-standard Function setting signal NS
Set the other party's personal identification number in S and send. Next, after transmitting the other party's personal identification number, the transmission terminal identification signal TS is transmitted by the modem section.
Set I's own terminal number and send.

Therefore, since the other party's personal identification number is set to the non-standard function setting signal NSS and transmitted to the other party's facsimile machine, the same non-recommended pattern based on the calculation result of the own facsimile machine is sent to the other party's facsimile machine. Also, the facsimile communication can be encrypted by setting the above, and it is possible to prevent the facsimile signal from being illegally received by eavesdropping or the like.

FIG. 7 is a diagram showing an embodiment of a flow chart for explaining the transmitting operation of the transmitting side facsimile apparatus according to the present invention. First, a transmission document is set on the document table of the scanner unit 1. Next, the operation display unit 6 displays "Do you want to send the fax code to the other facsimile machine?" (Process S40). Next, it is determined whether or not the personal identification number is used for transmission (process S41).

If the personal identification number is not used for transmission, the operator inputs the terminal number of the facsimile apparatus of the other party from the operation display section 6 (step S42). Next, the network control unit 5 makes a call to the facsimile machine of the other party based on the input terminal number of the other party (step S43). Next, the system control unit 7
Reads out the recommendation pattern based on the modem recommendation from the ROM section 10 and sets it in the pattern table of the encoding section 22 and the decoding section 40 of the modem section 4 (process S44). Next, CCITT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (processing S45).

On the other hand, in the case of transmitting using the personal identification number, the operator inputs the personal identification number of the partner facsimile machine from the operation display section 6 (step S46). Next, RAM
The pattern number and the partner terminal number corresponding to the personal identification number of the partner facsimile machine are read from the unit 11 (process S4).
7). Next, the network control unit 5 makes a call to the partner facsimile machine based on the input partner terminal number (process S4).
8).

Next, when the partner facsimile machine responds, the system controller 7 causes the partner facsimile machine to have a non-recommended pattern based on the non-standard function identification signal NSF received by the modem 4 from the partner facsimile machine. It is determined whether or not (process S49). If the partner facsimile machine has a non-recommended pattern, the sending terminal identification T
The own terminal number is set in SI and transmitted to the facsimile machine of the other party (process S50). The system control unit 7 reads the non-recommended pattern from the ROM unit 10 based on the pattern number and sets it in the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S51). Next, communication of image information is started based on the set non-recommendation pattern (process S45).

FIG. 8 is a diagram showing an embodiment of a flow chart for explaining the PIN code registration operation of the receiving side facsimile apparatus according to the present invention. In FIG. 8, first, the system control unit sets to the non-standard function identification signal NSF in the modem unit 4 that the own facsimile apparatus has the non-recommended pattern and transmits it to the partner facsimile apparatus (step S30). Next, the system control unit 7 determines whether or not the modem unit 4 has a personal identification number in the non-standard function setting signal NSS received from the partner facsimile machine (process S31).

When the nonstandard function setting signal NSS has a personal identification number, a specific calculation process is performed based on the personal identification number set in the nonstandard function setting signal NSS (process S3).
2). Here, since the specific calculation process performed in the process S32 is the same as the above-mentioned calculation formula (1), if the personal identification number set in the non-standard function setting signal NSS is used for the 4-digit number n, the same calculation result is obtained. It is possible to obtain the 2-digit calculation result A.

Next, the pattern number of the non-recommended pattern is selected based on the calculation result A (step S33). Next, the modem unit 4 receives the transmission terminal identification TSI from the partner facsimile machine, and registers the partner identification number and the pattern number of the non-recommendation pattern in the RAM unit 11 based on the partner terminal number set in the transmission terminal identification TSI. (Processing S3
4).

Thus, in this embodiment (claim 7),
The ROM section 10 is a CCITT recommendation V. 27 ter or V.I. The recommendation pattern corresponding to the bit group and the amount of phase change established based on 29, and a plurality of non-recommendation patterns avoiding the recommendation pattern are stored. here,
After the modem unit 4 sets the non-standard function identification signal NSF to the effect that the partner facsimile apparatus has a plurality of non-recommended patterns and transmits it, the secret code set in the non-standard function setting signal NSS from the partner facsimile apparatus in the modem unit 4 When the number is received, the system control unit 7 performs a specific calculation process based on the personal identification number set in the non-standard function setting signal NSS to obtain a calculation result. Next, when the partner terminal number is set in the transmission terminal identification signal TSI from the partner facsimile machine in the modem unit 4, the pattern number of the non-recommended pattern is determined corresponding to this calculation result, and it corresponds to this personal identification number. Then, the pattern number and the terminal number of the partner facsimile machine are stored in the RAM section 11.

Therefore, since the personal identification number transmitted from the partner facsimile machine is received and the particular facsimile machine performs a specific calculation process based on this personal identification number, it is the same as the non-recommended pattern obtained by the partner facsimile machine. The non-recommendation pattern can be set in the own facsimile device, the facsimile communication can be encrypted, and the facsimile signal can be prevented from being illegally received by eavesdropping or the like.

FIG. 9 is a diagram showing an embodiment of a flow chart for explaining the receiving operation of the receiving side facsimile apparatus according to the present invention. In FIG. 9, first, the system control unit sets, in the modem unit 4, a non-standard function identification signal NSF to the effect that there is a non-recommended pattern in the own facsimile device and transmits it to the partner facsimile device (process S60). Next, the system control unit 7 determines whether or not the nonstandard function setting signal NSS received by the modem unit 4 from the partner facsimile machine is set to include a non-recommendation pattern (process S6).
1).

If it is determined in step S61 that there is a non-recommendation pattern, the modem section 4 receives the transmission terminal identification signal TSI from the partner facsimile machine (step S61).
62). It is determined whether or not the partner terminal number set in the received transmission terminal identification signal TSI is registered in the RAM unit 11 (step S63). When the partner terminal number is registered in the RAM unit 11 in the process S63, the system controller 7 reads and reads the pattern number of the partner facsimile machine corresponding to the partner terminal number stored in the RAM unit 11. The non-recommendation pattern stored in the ROM unit 10 based on the pattern number is encoded by the encoding unit 22 of the modem unit 4.
And the pattern table of the decoding unit 40 (step S64). Next, communication of image information is started based on the non-recommendation pattern (process S65).

On the other hand, in process S63, the partner terminal number is RA.
If it is not registered in the M section 11, the system control section sets, in the modem section 4, the nonstandard function identification signal NSF to the effect that the pattern number of the non-recommended pattern is not registered in the own facsimile apparatus, and the other facsimile apparatus is set. To (step S67). Next, the system control unit disconnects the communication line by the network control unit 5 (step S68).

In step S61, when it is not set that there is a non-recommendation pattern, the system control unit 7 reads the recommendation pattern based on the modem recommendation from the ROM unit 10, and the encoding unit 22 of the modem unit 4 and It is set in the pattern table of the decoding unit 40 (process S66). Then CC
ITT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (process S65).

Thus, in this embodiment (claim 8),
When the communication with the partner facsimile machine is started via the communication line, if the partner terminal number set in the transmission terminal identification signal TSI in the modem unit 4 matches the terminal number stored in the RAM unit 11, the RAM unit 11 The non-recommendation pattern stored in the ROM section 10 is set in the pattern table of the modem section 4 based on the pattern number of the partner facsimile machine corresponding to the partner terminal number stored in the.

Accordingly, when the facsimile reception is started from the partner facsimile machine via the communication line, if the terminal number of the partner facsimile machine matches the already stored terminal number, the pattern number corresponding to this terminal number. By setting the non-recommendation pattern stored in the pattern table of the modem section based on the above, it is possible to perform encrypted facsimile communication with the same facsimile device of the other party, and prevent the facsimile signal from being illegally received by eavesdropping or the like. Therefore, the convenience of the user can be improved.

(Embodiment 3) This embodiment (claims 9 to 13)
This can also be applied to the facsimile apparatus described in FIG. 1 as in the first embodiment. In the present embodiment, the present invention (claim 9)
Specific features of (13) to 13) will be described. FIG. 10 is a diagram showing an embodiment of a flow chart for explaining the transmission registration operation of the random number pattern of the facsimile apparatus according to the present invention.

As shown in FIG. 10, in the transmitting side facsimile apparatus, the operation display section 6 displays "Do you want to communicate using a random number pattern?" (Process S70). Next, the operator inputs from the operation display unit 6 whether or not to use the random number pattern (step S71). When the random number pattern is used in the process S71, the terminal number of the partner facsimile machine is input and stored in the RAM unit 11 (process S7).
2). Next, the network control unit 5 makes a call to the facsimile machine of the other party based on the input terminal number of the other party (process S7).
3). Next, when the other facsimile machine responds,
Based on the non-standard function identification signal NSF received by the modem section 4 from the partner facsimile machine, the system control section 7
It is determined whether or not the counterpart facsimile machine is set to communicate with a random number pattern (step S74).

In step S74, if communication is possible with the random number pattern, the system control unit 7 determines that the random number pattern corresponding to the input partner terminal number is in the RAM in order to know whether or not it is the first communication with the partner facsimile machine. It is determined whether or not it is registered in the section 11 (step S75). Process S75
Then, in the case of the first communication, the random number generation unit 8 calculates a random number pattern based on a specific calculation process, and registers the random number pattern of the calculation result in the RAM unit 11 corresponding to the partner terminal number (process S76). .

In this specific arithmetic processing, for example, the time information t of the clock section is used as the start information, and the random number pattern of the arithmetic result R is obtained based on the arithmetic expression r (t). R = r (t) (2) Next, a random number pattern is set in the non-standard function setting signal NSS, and it is transmitted from the modem section 4 to the partner facsimile machine (step S77). Next, the own terminal number is set in the transmission terminal identification TSI and is transmitted to the partner facsimile machine (process S).
78). Next, the system control unit 7 reads the random number pattern registered in the RAM unit 11, and the read random number pattern is used by the encoding unit 22 and the decoding unit 40 of the modem unit 4.
Is set in the pattern table (process S79). next,
Communication of image information is started based on the random number pattern (process S81).

On the other hand, if communication cannot be performed with the random number pattern in the process S74, or if it is not the first communication in the process S75, the system control unit 7 reads the recommendation pattern based on the modem recommendation from the ROM unit 10, The patterns are set in the pattern tables of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S80). Next, CCITT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (process S81).

Thus, in this embodiment (claim 9),
The operation display unit 6 inputs the terminal number of the facsimile machine of the other party who communicates via the communication line, and the network control unit 5 calls the network based on the input terminal number. Here, when communicating with the other facsimile machine for the first time, the random number generation unit 8 generates a random number pattern of a plurality of bit groups, and the generated random number pattern is stored in the RAM corresponding to the terminal number input on the operation display unit 6. It is stored in the section 11. Next, the system control unit 7 reads the random number pattern corresponding to this terminal number stored in the RAM unit 11, and sets the random number pattern in the pattern table of the modem unit 4.

Therefore, by setting a random number pattern of a plurality of bit groups avoiding the recommendation pattern in the pattern table of the modem section, the facsimile communication can be encrypted, and the facsimile signal can be prevented from being illegally received by eavesdropping or the like. can do. As described above, in the present embodiment (claim 10), after the random number generator 8 generates a random number pattern, the generated random number pattern is used as the non-standard function setting signal N.
Modem section 4 is set to SS and is transmitted to the facsimile machine of the other party, and its own terminal number is set to transmission terminal identification signal TSI, and the modem section 4 is transmitted to the facsimile machine of the other party.

Therefore, by transmitting the random number pattern to the partner facsimile machine, the same random number pattern as that set in the own facsimile machine can also be set in the partner facsimile machine, and the facsimile communication can be encrypted. It is possible to prevent the facsimile signal from being illegally received. Thus, the present embodiment (claim 1
In 1), the terminal number input on the operation display unit 6 is already R
If it is stored in the AM unit 11, the random number pattern stored in the RAM unit 11 is read out based on this terminal number, and the random number pattern is set in the pattern table of the modem unit 4.

Therefore, when starting the facsimile transmission to the partner facsimile machine via the communication line, if the inputted terminal number matches the already stored terminal number, the random number pattern corresponding to this terminal number is set. By setting it in the pattern table of the modem section, encrypted facsimile communication with the same facsimile machine can be performed, and it is possible to prevent unauthorized reception of facsimile signals due to eavesdropping, etc., improving user convenience. can do.

FIG. 11 is a diagram showing an embodiment of a flow chart for explaining the random number pattern reception registration operation of the facsimile apparatus according to the present invention. In FIG. 11, first,
The non-standard function identification signal N in the modem section 4 indicates that the system control section 7 can communicate with the own facsimile device by a random number pattern.
It is set to SF and transmitted to the facsimile machine of the other party (process S90). Next, the system control unit 7 determines whether the modem unit 4 has received the non-standard function setting signal NSS from the partner facsimile machine (step S91).

When the non-standard function setting signal NSS is received, the random number pattern set in the non-standard function setting signal NSS is stored in the RAM section 11 (step S92). next,
The modem unit 4 identifies the sending terminal identification T from the partner facsimile machine.
SI is received (process S93). Next, the system control unit 7 knows whether a random number pattern corresponding to the partner terminal number set in the received transmission terminal identification TSI is registered in the RAM unit 11 in order to know whether or not it is the first communication with the partner facsimile machine. It is determined whether or not (step S94).

In the process S75, in the case of the first communication, the random number pattern is registered as the non-recommendation pattern in the RAM section 11 corresponding to the partner terminal number (process S95). On the other hand, in the process S75, if it is not the first communication, the random number pattern registered in the RAM unit 11 corresponding to the partner terminal number is read out and stored in the pattern tables of the encoding unit 22 and the decoding unit 40 of the modem unit 4. It is set (process S96). Next, communication of image information is started based on the random number pattern (process S97).

As described above, in this embodiment (claim 12), when communicating with the facsimile machine for the first time based on the partner terminal number set in the transmitting terminal identification signal TSI received by the modem unit 4, The random number pattern set in the non-standard function setting signal NSS received by the modem unit 4 is stored in the RAM unit 11 in correspondence with the partner terminal number. Next, the random number pattern corresponding to the partner terminal number stored in the RAM section 11 is read out, and this random number pattern is set in the pattern table of the modem section 4.

Therefore, by setting the random number pattern received from the partner facsimile machine in the pattern table of the modem section, the same random number pattern as that set in the partner facsimile machine is also set in the own facsimile machine to perform facsimile communication. It is possible to prevent the facsimile signal from being illegally received by eavesdropping or the like.

As described above, in this embodiment (claim 13), when the partner terminal number set in the transmission terminal identification signal TSI received by the modem section 4 is already stored in the RAM section 11, The random number pattern stored in the RAM unit 11 is read out based on this partner terminal number, and this random number pattern is set in the pattern table of the modem unit 4. Therefore, when starting the facsimile reception from the facsimile machine of the other party through the communication line, if the terminal number of the facsimile machine of the other party matches the already stored terminal number, the random number pattern corresponding to this terminal number is used as the modem section. By setting the same in the pattern table of No. 3, it is possible to perform encrypted facsimile communication with the same facsimile machine, prevent unauthorized reception of facsimile signals due to eavesdropping, etc., and improve user convenience. You can

(Fourth Embodiment) This embodiment (Claim 14) can be applied to the facsimile apparatus described in FIG. 1 as in the first embodiment. In this embodiment, the present invention (claim 14)
The characteristic part of is specifically described. 12 and 13 are diagrams showing an embodiment of a flow chart for explaining the arithmetic processing of the transmitting side facsimile apparatus according to the present invention.

As shown in FIGS. 12 and 13, "Do you want to communicate using the calculation pattern?" Is displayed on the operation display unit 6 in the transmitting side facsimile machine (step S100).
Next, the operator inputs from the operation display unit 6 whether or not to use the calculation pattern (process S101). Process S10
When the calculation pattern is used in 1, the terminal number of the partner facsimile machine is input and stored in the RAM section 11 (step S102). Next, the network control unit 5 makes a call to the partner facsimile machine based on the input partner terminal number (step S103). Next, when the other facsimile machine responds, the system control section 7 causes the modem section 4 to receive the non-standard function identification signal NSF received from the other facsimile machine.
On the basis of the above, it is determined whether or not it is set that the partner facsimile machine can communicate in the calculation pattern (step S104).

If it is possible to communicate in the calculation pattern in the process S104, the nonstandard function setting signal NSS is set to the effect that the calculation pattern is used and the modem unit 4 transmits it to the partner facsimile machine (process S105). Next, the own terminal number is set in the transmission terminal identification TSI and transmitted to the partner facsimile machine (step S106). Next, the system control unit 7 reads the number of times of communication corresponding to the partner terminal number stored in the RAM unit 11 in order to know whether or not it is the first communication with the partner facsimile machine (step S107). Next, it is determined whether or not it is the first communication based on the number of times of communication corresponding to the partner terminal number (process S108).

In step S108, if the communication is not the first communication with the partner facsimile machine, the calculation result of the previous communication with the partner terminal stored in the RAM 11 is read out,
The previous set value b is set (step S109). On the other hand, in the process S108, in the case of the first communication with the partner facsimile machine, the initial value stored in the ROM unit 10 is read and set to the previously set value b (process S110).

Next, the system control unit 7 sets the previous set value b.
To the calculation formula (3) to obtain the calculation result (process S1
11). In this arithmetic processing, the arithmetic result sequence A is obtained as an arithmetic pattern based on the arithmetic expression E (b). A = E (b) (3) Next, the system control unit 7 sets the sequence A of the calculation result as the previous set value b for use in the next communication, and the RAM unit 11
(Step S112). Next, 1 is added to the communication count corresponding to the partner terminal number stored in the RAM unit 11 (step S113). Next, the system control unit 7 is a RAM
The calculation result stored in the unit 11 is read as a calculation pattern, and the read calculation pattern is set in the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S114). Next, communication of image information is started based on the calculation pattern (process S115).

On the other hand, process S101 or process S104
Then, when communication cannot be performed with the calculation pattern, the system control unit 7 ROMs the recommendation pattern based on the modem recommendation.
It is read from the unit 10 and set in the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S1
16). Next, CCITT Recommendation V. 27 ter, V.I. Two
Based on step 9, communication of image information is started (process S11).
5).

FIG. 14 is a diagram showing an embodiment of a flow chart for explaining the arithmetic processing of the receiving side facsimile apparatus according to the present invention. As shown in FIG. 14, in the receiving side facsimile device, the non-standard function identification signal NSF is set in the modem part 4 to the effect that the system control part 7 can communicate with the own facsimile device by a calculation pattern, and it is transmitted to the partner facsimile device. (Processing S120). Next, the system control unit 7 determines whether the non-standard function setting signal NSS received by the modem unit 4 from the partner facsimile machine is set to allow communication in the calculation pattern (process S12).
1).

In step S121, when the facsimile machine of the other party can communicate with the calculation pattern, the modem section 4 receives the transmission terminal identification signal TSI from the facsimile machine of the other party, and the other party set in the received transmission terminal identification signal TSI. The terminal number is stored in the RAM unit 11 (process S122).
Next, the system control unit 7 reads the number of times of communication with the facsimile machine of the other party corresponding to the other party's terminal number stored in the RAM section 11 (step S123). Next, it is determined whether or not it is the first communication based on the number of times of communication corresponding to the partner terminal number (process S124).

If it is not the first communication with the partner facsimile machine in process S124, the calculation result of the previous communication with the partner terminal stored in the RAM 11 is read out,
The previous set value b is set (process S125). On the other hand, in the process S124, in the case of the first communication with the partner facsimile machine, the initial value stored in the ROM unit 10 is read out and set to the previously set value b (process S126).

Next, the system control unit 7 sets the previous set value b.
To the calculation formula (3) to obtain the calculation result (process S1
27). Next, the system control unit 7 sets RA as the last set value b of the arithmetic result sequence A for use in the next communication.
It is stored in the M unit 11 (process S128). Next, 1 is added to the number of times of communication corresponding to the partner terminal number stored in the RAM unit 11.
Is added (process S129). Next, the system control unit 7
Reads the calculation result stored in the RAM unit 11 as a calculation pattern, and sets the read calculation pattern in the pattern table of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S130). Next, communication of image information is started based on the calculation pattern (process S131).

On the other hand, in step S121, when communication cannot be performed with the calculation pattern, the system control unit 7 reads the recommendation pattern based on the modem recommendation from the ROM unit 10,
It is set in the pattern tables of the encoding unit 22 and the decoding unit 40 of the modem unit 4 (process S132). Next, CCI
TT Recommendation V. 27 ter, V.I. Based on 29, communication of image information is started (process S131).

As described above, in this embodiment (Claim 14), when the communication with the partner facsimile machine is started for the first time via the communication line, the system control unit 7 executes a predetermined number sequence based on a predetermined calculation process. Is calculated to obtain a first number sequence, and the first number sequence is stored in the RAM unit 11. RAM
The first number sequence stored in the unit 11 is set in the pattern table of the modem unit 4 as a pattern of a plurality of bit groups. On the other hand, when starting the second and subsequent communications with the partner facsimile machine via the communication line, the system control unit 7 calculates a sequence of numbers stored in the RAM unit 11 on the basis of a predetermined calculation process to newly generate a new sequence. A sequence of numbers is obtained, and the sequence of new calculated results is updated and stored in the RAM unit 11. Next, the new number sequence stored in the RAM section 11 is set in the pattern table of the modem section 4 as a pattern of a plurality of bit groups.

Therefore, when the communication with the partner facsimile machine is started for the first time through the communication line, the predetermined sequence of numbers is calculated based on the predetermined calculation process to obtain the calculation result. The same calculation result is obtained without communicating the calculation result with the receiving side facsimile apparatus. When starting the second and subsequent communications with the partner facsimile machine via the communication line, the stored number sequence is calculated based on a predetermined calculation process to obtain a new number sequence, and this new number sequence is obtained. By setting in the pattern table of the modem as a pattern of multiple bit groups, encrypted facsimile communication can be performed without using the same pattern, and it is possible to prevent unauthorized reception of facsimile signals due to eavesdropping or the like. it can.

[0103]

According to the present invention, the same non-recommendation pattern is set in the pattern tables of the modem section of the own facsimile apparatus and the partner facsimile apparatus, encrypted facsimile communication can be performed, and the facsimile signal is illegal due to eavesdropping or the like. It can be prevented from being received by the user and the convenience of the user can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a facsimile apparatus 100 according to the present invention.

FIG. 2 is a diagram showing an embodiment of a modem unit 4 according to the present invention.

FIG. 3 is a diagram showing an example of a relationship between 3-bit data and a phase change amount of a modem unit 4 according to the present invention.

FIG. 4 is a diagram showing an embodiment of a communication protocol of the facsimile apparatus 100 according to the present invention.

FIG. 5 is a diagram showing a flowchart of a receiving operation of the facsimile apparatus according to the present invention.

FIG. 6 is a diagram showing an embodiment of a flowchart for explaining a PIN code registration operation of the facsimile apparatus according to the present invention.

FIG. 7 is a diagram showing an embodiment of a flow chart for explaining a transmission operation of the transmission side facsimile apparatus according to the present invention.

FIG. 8 is a diagram showing an embodiment of a flow chart for explaining a PIN code registration operation of the receiving side facsimile apparatus according to the present invention.

FIG. 9 is a diagram showing an embodiment of a flow chart for explaining a receiving operation of the receiving side facsimile apparatus according to the present invention.

FIG. 10 is a diagram showing an embodiment of a flow chart for explaining a random number pattern transmission registration operation of the facsimile apparatus according to the present invention.

FIG. 11 is a diagram showing an embodiment of a flowchart for explaining the reception registration operation of the random number pattern of the facsimile apparatus according to the present invention.

FIG. 12 is a diagram showing an embodiment of a flow chart for explaining a calculation process of the transmitting side facsimile apparatus according to the present invention.

FIG. 13 is a diagram showing an embodiment of a flow chart for explaining a calculation process of the transmitting side facsimile apparatus according to the present invention.

FIG. 14 is a diagram showing an embodiment of a flowchart for explaining a calculation process of the receiving side facsimile apparatus according to the present invention.

[Explanation of symbols]

1 Scanner Section 2 Plotter Section 3 Encoding / Decoding Section 4 Modem Section (Protocol Signal Communication Means, Modem Means) 5 Network Control Section (Network Calling Means) 6 Operation Display Section (Input Means) 7 System Control Section (Pattern Selection Means) , Arithmetic means, first arithmetic means, second arithmetic means, sequence updating means) 8 random number generating section (random number generating means) 9 telephone 10 ROM section (pattern storing means) 11 RAM section (personal code information storing means, pattern information) Storage unit) 12 system bus 21 scrambler 22 encoding unit 23 transmission filter 24 modulation unit 25 D / A conversion unit 26 output filter 31 reception filter 32 A / D conversion unit 33 AGC 34 demodulation unit 35 automatic equalizer 36 timing reproduction Part 37 Phase synchronization part 38 Judgment device 39 Error calculation part 40 Decoding part 41 Descrambler 100 Facsimile device

Continuation of front page (56) Reference JP-A-4-257134 (JP, A) JP-A-63-288545 (JP, A) JP-A-3-154458 (JP, A) JP-A-4-81152 (JP , A) JP 4-167672 (JP, A) JP 3-184477 (JP, A) JP 3-34640 (JP, A) JP 6-6616 (JP, A) JP 4-142164 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 1/32-1/36 H04N 1/42-1/44

Claims (14)

(57) [Claims] 1. Dividing communication data into bit groups, generating signal points based on the phase change amount corresponding to each bit group, and converting the signal points into bit groups corresponding to the phase change amount of the signal points. In an eavesdropping prevention system for a facsimile modem that generates communication data by means of communication, it has a recommendation pattern corresponding to a bit group and a phase change amount established based on a recommendation, and has a plurality of non-recommendation patterns that avoid the recommendation pattern. A method for preventing eavesdropping of a facsimile modem, which is characterized in that 2. If the partner facsimile machine does not have the non-recommendation pattern, the recommendation pattern is set based on the non-standard function identification signal NSF received from the partner facsimile machine via the communication line. The method of preventing eavesdropping of a facsimile modem according to claim 1, characterized in that: 3. When the partner facsimile machine has the non-recommendation pattern, the non-recommendation pattern is set based on the non-standard function identification signal NSF received from the partner facsimile machine via the communication line. The wiretapping prevention system for a facsimile modem according to claim 1, wherein the system is configured. 4. A pattern storage unit for storing a recommended pattern corresponding to a bit group and a phase change amount established based on the recommendation, and a plurality of non-recommended patterns avoiding the recommended pattern, and a partner via a communication line. When a pattern number is set in the protocol signal communication means for communicating the protocol signal with the facsimile machine and the non-standard function identification signal NSF received by the protocol signal communication means, the non-standard function stored in the pattern storage means is stored. It is characterized by further comprising: pattern selecting means for selecting a non-recommended pattern that matches the pattern number from the recommended pattern; and modem means having a pattern table for setting the non-recommended pattern selected by the pattern selecting means. Facsimile machine. 5. A pattern storage unit that stores a recommendation pattern corresponding to a bit group and a phase change amount that are established based on the recommendation, and a plurality of non-recommendation patterns that avoid the recommendation pattern, and a terminal number of the partner facsimile machine. And an input means for inputting a personal identification number corresponding to the terminal number, an arithmetic means for performing a specific arithmetic processing based on the input personal identification number to obtain an arithmetic result, and a non-recommendation pattern based on the arithmetic result. When determining a pattern number and starting communication with a partner facsimile machine via a communication line and a secret code storage means for storing the pattern number and the terminal number of the partner facsimile machine corresponding to the secret code,
When a personal identification number is input by the input means, network calling means for making a call to the network based on the terminal number of the facsimile apparatus of the other party corresponding to the personal identification number stored in the personal identification information storage means, Facsimile means having a pattern table for setting the non-recommended pattern stored in the pattern storage means based on the pattern number corresponding to the personal identification number stored in the personal identification information storage means. apparatus. 6. Protocol signal communication means for communicating a protocol signal with a facsimile machine of the other party via a communication line,
When starting the communication with the partner facsimile machine and registering the pattern number corresponding to the personal identification number in the partner facsimile machine, after calling by the network calling means and connecting to the partner facsimile machine, The protocol signal communication means sets the non-standard function setting signal NSS to the other party's personal identification number and transmits it, and after transmitting the other party's personal identification number, the protocol signal communication means sets the own terminal number in the transmission terminal identification signal TSI and transmits it. The facsimile apparatus according to claim 5, wherein 7. A pattern storage unit for storing a recommended pattern corresponding to a bit group and a phase change amount established based on the recommendation, and a plurality of non-recommended patterns avoiding the recommended pattern, and a partner via a communication line. A protocol signal communication unit that communicates a protocol signal with a facsimile device, and the protocol signal communication unit sets the fact that it has a plurality of non-recommended patterns to the partner facsimile device, and then transmits the protocol signal communication unit from the partner facsimile device. When the personal identification number set in the non-standard function setting signal NSS is received, an arithmetic means for performing a specific arithmetic processing based on the personal identification number set in the non-standard function setting signal NSS to obtain an arithmetic result, Transmission terminal identification signal TSI from partner facsimile machine by protocol signal communication means
If the other party's terminal number is set in, the pattern number of the non-recommendation pattern is determined in correspondence with the calculation result, and the code number and the terminal number of the other party's facsimile machine are stored in correspondence with the secret code number. A facsimile apparatus comprising: an information storage unit. 8. A terminal in which the other party's terminal number set in the transmission terminal identification signal TSI by the protocol signal communication means is stored in the personal identification information storage means when starting communication with the other party's facsimile apparatus via a communication line. If it matches the number, a pattern table for setting the non-recommended pattern stored in the pattern storage means based on the pattern number of the partner facsimile machine corresponding to the partner terminal number stored in the personal identification information storage means is displayed. A modem means having
The facsimile apparatus according to claim 7, further comprising: 9. An input means for inputting a terminal number of a facsimile machine of the other party communicating via a communication line, a network calling means for making a call to a network based on the inputted terminal number, and the facsimile machine of the other party. When communicating for the first time, random number generation means for generating a random number pattern of a plurality of bit groups, pattern information storage means for storing the generated random number pattern in correspondence with the terminal number input by the input means, A facsimile apparatus comprising: a modem unit having a pattern table for reading a random number pattern corresponding to the terminal number stored in the pattern information storage unit and setting the random number pattern. 10. A protocol signal communication unit for communicating a protocol signal with a facsimile machine of the other party via a communication line, wherein the random number generating unit generates a random number pattern, and the generated random number pattern is a non-standard function setting signal. N
7. The transmission method is set to SS and transmitted to the facsimile machine of the other party by the protocol signal communication means, and the own terminal number is set to the transmission terminal identification signal TSI and transmitted to the facsimile machine of the other party by the protocol signal communication means. 9. The facsimile machine according to item 9. 11. When the terminal number input by the input means is already stored in the pattern information storage means, a random number pattern stored in the pattern information storage means is read out based on the terminal number, 10. The facsimile apparatus according to claim 9, wherein the random number pattern is set in the pattern table of the modem means. 12. A partner based on a protocol signal communication unit for communicating a protocol signal with a partner facsimile machine via a communication line and a partner terminal number set in a transmission terminal identification signal TSI received by the protocol signal communication unit. When communicating with a facsimile machine for the first time, the non-standard function setting signal N received by the protocol signal communication means is received.
A pattern information storage unit that stores the random number pattern set in SS corresponding to the partner terminal number, and a pattern that reads the random number pattern corresponding to the partner terminal number stored in the pattern information storage unit and sets the random number pattern A facsimile apparatus comprising: a modem unit having a table. 13. If the partner terminal number set in the transmission terminal identification signal TSI received by the protocol signal communication means is already stored in the pattern information storage means, the partner terminal number is used as a basis for the communication. 13. The facsimile apparatus according to claim 12, wherein the random number pattern stored in the pattern information storage means is read and the random number pattern is set in the pattern table of the modem means. 14. A first arithmetic means for operating a predetermined number sequence based on a predetermined arithmetic process to obtain a first number sequence when starting communication with a facsimile machine for the first time via a communication line. When starting the second and subsequent communications with a partner facsimile machine via a communication line, a sequence storing means for storing the first sequence calculated by the first computing means is stored in the sequence storing means. Second arithmetic means for operating the stored numerical sequence based on the predetermined arithmetic processing to obtain a numerical sequence, and updating the result sequence calculated by the second arithmetic means in the numerical sequence storage means and storing it. A facsimile apparatus comprising: a sequence updating means; and a modem means having a pattern table for setting the sequence stored in the sequence storing means as a pattern of a plurality of bit groups.