JP5083267B2 - Communication system and transmitter - Google Patents

Description

The present invention relates to a communication system and a transmission apparatus that transmit and receive data wirelessly.

  Conventionally, as a communication system, a communication system in which a user terminal such as a personal computer and a peripheral device such as a printer device are communicably connected via a LAN (local area network) is known. As peripheral devices, multi-function devices having a printer function, a scanner function, a copy function, a facsimile function, and the like are known.

  In addition, as a conventional system, an NCU (Network Control Unit) and a modem necessary for facsimile communication are separated from a multi-function device and incorporated in a communication device independent of the multi-function device. A communication system is known in which a functional device is connected to a LAN, and facsimile data to be transmitted generated by the multi-function device is transmitted to the public telephone line network via the LAN and the communication device (patent). Reference 1).

  According to this communication system, the NCU that needs to be connected to the telephone line is provided in the communication device that is independent of the multi-function device. Therefore, as compared with the case where the multi-function device incorporating the NCU and the modem is used. There is no need to connect a telephone line to the multi-function device, and there is an advantage that the degree of freedom of installation of the multi-function device is improved.

  In addition, the communication system of the above type is a system including a digital cordless telephone (slave unit) capable of communicating with the communication apparatus incorporating an NCU or the like, and a command input from the digital cordless telephone is transmitted to the communication apparatus. There has been known a communication system in which a digital cordless telephone is made to function as a remote controller for a multi-function device by inputting to the multi-function device via the.

JP 2007-089040 A

  By the way, the present inventor is considering further improving the installation flexibility of the multi-function device by adopting a wireless LAN instead of a wired LAN as the LAN connecting the communication device and the multi-function device. However, in a wireless LAN, there is a possibility that communication data may be viewed as malicious due to low security.

  That is, when a user transmits / receives facsimile data through a public telephone line network, it is normal to expect high confidentiality of the public telephone line network. If the data is transferred to the multi-function device or the like through a wireless LAN, information leakage may occur in the transfer process.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a technique capable of firmly preventing information leakage even when data is transmitted and received wirelessly.

First inventions has been made in order to achieve the above object, there is provided a communication system comprising a transmitting device, and a first and second receiver for receiving the data transmitted from the transmission device, each The apparatus is configured as follows.

  The transmission device transmits data in a first transmission unit that transmits data in a predetermined first wireless communication method, and in a second wireless communication method different from the predetermined first wireless communication method. Second transmitting means, encrypting means for encrypting data to be transmitted to the first receiving device, and transmitting target data encrypted by the encrypting means to the first receiving device. A first transmission control means for transmitting the data to the second transmission means, and a second transmission means for transmitting a decryption key for decrypting the data to be transmitted encrypted by the encryption means to the second receiving device. Two transmission control means.

  On the other hand, the first receiver is acquired by a receiver that can receive data transmitted from the first transmitter included in the transmitter, a key acquisition unit that acquires a decryption key, and a key acquisition unit through an input interface. And a decrypting means for decrypting the data received by the receiving means of the device itself, and a data storing means for storing the data decrypted by the decrypting means.

  In addition to this, the second receiving device is configured to receive a receiving unit capable of receiving data transmitted from the second transmitting unit included in the transmitting device, and a decryption key received by the receiving unit of the own device from the transmitting device. And a notifying means for outputting a display or a sound to a user who uses the receiving apparatus.

  That is, in this communication system, the data to be transmitted from the transmitting device to the first receiving device is encrypted to improve confidentiality, and the wireless communication method is different from the wireless communication method used when transmitting the encrypted data. By transmitting a decryption key for decrypting encrypted data from the transmitting device to the second receiving device, the possibility that the encrypted data can be decrypted even if the encrypted data leaks is reduced. ing.

  Further, in this communication system, the decryption key is transmitted from the transmission device of the encrypted data transmission source to the second reception device, and notified to the user via the second reception device. By adopting a configuration in which the data received from the transmission device is decrypted using the decryption key input through the input interface, the decryption key does not have to be a fixed key. That is, in this communication system, even if a different decryption key is set for each encrypted data, the decryption key is quickly transmitted to the authorized user so that the first receiving device can normally decrypt the encrypted data. Yes.

  Therefore, according to this communication system, by setting a different decryption key for each encrypted data, data is transmitted from the transmitting device to the first receiving device with higher confidentiality than the conventional system in which the decryption key is fixed. be able to. As a result, according to the present invention, information leakage due to wireless communication can be firmly prevented.

  In order to firmly prevent the decryption key from leaking, it is necessary to adopt a wireless communication method with higher confidentiality than the first wireless communication method as the second wireless communication method. The communication method is preferably a unique specification (proprietary protocol) for each product or manufacturer.

  If the communication method is an original specification, the possibility of leakage of the decryption key when transmitting the decryption key from the transmission device to the second reception device can be suppressed as much as possible by taking a measure that does not disclose the specification. Further, in the second wireless communication system, since only the decryption key is transmitted and received, even if a unique protocol is adopted, a highly confidential communication system can be constructed at low cost.

Further, the second inventions which have been made in order to achieve the above object, comprises a first and a second transmitting device, and a receiver for receiving data transmitted from the first and second transmission device In this communication system, each device is configured as follows.

  That is, the first transmission apparatus includes a transmission means for transmitting data, an encryption means for encrypting data to be transmitted to the reception apparatus, and a transmission means of the own apparatus in a first predetermined wireless communication method. A transmission control means for transmitting the transmission target data encrypted by the encryption means to the receiving device, and a decryption key for decrypting the transmission target data encrypted by the encryption means, And a notification means for outputting a display or a sound to a user who uses the transmission apparatus.

  Further, the second transmission device includes a transmission means for transmitting data in a second wireless communication system different from the first wireless communication system determined in advance, and a key acquisition means for acquiring a decryption key through the input interface. And a transmission control unit that causes the transmission unit of the own device to transmit the decryption key acquired by the key acquisition unit to the reception device.

  In addition, the receiving device includes a first receiving unit capable of receiving data transmitted from the first transmitting device, a second receiving unit capable of receiving data transmitted from the second transmitting device, and a first receiving unit. The data received by the means from the first transmitter is stored on the basis of the decryption key received by the second receiver from the second transmitter, and the data decrypted by the decoder is stored. Data storage means.

  According to the communication system configured as described above, leakage of data transmitted from the first transmission device to the reception device by radio can be firmly prevented for the same reason as in the first invention.

Further, the third inventions has been made in order to achieve the above object, a transmission device, a communication system comprising a receiving apparatus, a receiving data transmitted from the transmission device, each device follows It is comprised as follows.

  The transmission device transmits data in a first transmission unit that transmits data in a predetermined first wireless communication method, and in a second wireless communication method different from the predetermined first wireless communication method. Second transmission means for encrypting, transmission means for encrypting data to be transmitted to the reception apparatus, and first transmission means for transmitting the transmission target data encrypted by the encryption means to the reception apparatus. For each transmission of the transmission target data encrypted by one transmission control unit and the encryption unit, the second transmission unit receives a decryption key for decrypting the transmission target data encrypted by the encryption unit. Second transmission control means for transmitting to the apparatus.

  The receiving device includes a first receiving unit capable of receiving data transmitted from the first transmitting unit, a second receiving unit capable of receiving data transmitted from the second transmitting unit, and the first receiving unit transmitting the data. Decoding means for decrypting data received from the apparatus based on the decryption key received from the transmitting apparatus by the second receiving means, and data storage means for storing the data decrypted by the decrypting means.

  According to the communication system configured in this way, every time encrypted data is transmitted, the decryption key corresponding to the encrypted data is transmitted to the encrypted data transmission destination device. Can send data to. Further, according to this communication system, since the user does not need to input a decryption key, convenience can be improved.

In the communication system corresponding to the first and third inventions, the transmission device can be configured to include a facsimile communication means capable of communicating with an external facsimile device, and the encryption means is used as data to be transmitted. facsimile communication means Ru can configure the facsimile data received from the external facsimile device as a means for encrypting.

  According to the communication system configured as described above, the transmission apparatus can transmit the facsimile data received from the external facsimile apparatus through the facsimile communication means to the reception apparatus with high confidentiality. Therefore, according to the present invention, when the NCU and the modem of the multi-function device are separated, the multi-function device is composed of a main device connected to the telephone line network and a sub-device capable of wireless communication with the main device. The facsimile data can be transferred to the secondary device with high confidentiality while improving the degree of freedom of installation of the secondary device.

In the communication system corresponding to the second and third inventions, the receiving device is a facsimile communication means capable of communicating with an external facsimile apparatus, a facsimile communication means, a decryption means decrypted by the decryption means, and a data storage means. the stored data, a facsimile transmission control means for facsimile transmission, Ru can be configured to include a.

  According to the communication system configured as described above, the NCU and the modem of the multi-function device are separated, and the multi-function device is composed of a main device connected to the telephone network and a sub-device capable of wireless communication with the main device. In this case, facsimile data can be transmitted from the secondary device to an external facsimile device with high confidentiality while improving the degree of freedom of installation of the secondary device.

  The well-known wireless LAN employs an IEEE802.11x wireless communication system, and in this wireless communication system, wireless communication is performed by a direct spread system that is a kind of spread spectrum system. On the other hand, as another spread spectrum method, a frequency hopping method is known, and a frequency hopping method in which communication is performed while changing a frequency band is different from a direct spread method in which communication is always performed using a certain frequency band. Excellent confidentiality.

Therefore, in the communication system, the first wireless communication method adopts a wireless communication method that performs wireless communication by the direct spreading method, and the second wireless communication method uses wireless communication that performs wireless communication by the frequency hopping method. it has preferred to adopt the method.

  If a wireless communication method corresponding to the popular wireless LAN standard is adopted as the first wireless communication method and a wireless communication method based on a proprietary frequency hopping method is adopted as the second wireless communication method, the communication system is The constituent transmission device and reception device can be easily incorporated into an existing wireless network, and the decryption key can be transmitted and received with high security between the transmission device and the reception device. As a result, encryption via the wireless LAN is possible. Data leakage about data can be firmly prevented.

Further, the fourth inventions, there is provided a communication device, different from in the first wireless communication system to a predetermined, a first transmission means for transmitting data, a first wireless communication system to a predetermined In the second wireless communication system, the second transmission means for transmitting data, the encryption means for encrypting the transmission target data to be transmitted to the first transmission means, and the first transmission means are encrypted by the encryption means. For each transmission of the transmission target data encrypted by the encryption means and the first transmission control means for transmitting the transmission target data to the receiving apparatus capable of wireless communication by the first wireless communication method. Second transmission control means for causing the transmission means to transmit a decryption key for decrypting the transmission target data encrypted by the encryption means, to a receiving apparatus capable of wireless communication by the second wireless communication method; It is characterized by providing.

If this communication apparatus is used, a communication system corresponding to the first and third inventions can be constructed. Incidentally, the communication device comprises an external facsimile apparatus capable of communicating with a facsimile communication unit, as the transmission target data, Ru can be configured to encrypt the facsimile data by the facsimile communication means is received from an external facsimile device .

Further, the fifth inventions, there is provided a communication apparatus, transmitting apparatus for transmitting encrypted data in a first wireless communication system to a predetermined, receivable first receiving encrypted data transmitted from the Receiving a decryption key transmitted from the means and a transmitting device for transmitting a decryption key for decrypting the encrypted data in a second wireless communication method that is different from the first wireless communication method A possible second receiving means, and a decrypting means for decrypting the encrypted data received by the first receiving means based on the decryption key received by the second receiving means in accordance with the reception of the encrypted data; Data storage means for storing data decoded by the decoding means.

If this communication apparatus is used, the communication system corresponding to 2nd and 3rd invention can be comprised. The communication apparatus includes a facsimile communication means capable of communicating with an external facsimile apparatus, and a facsimile transmission control means for causing the facsimile communication means to transmit the data decoded by the decoding means and stored in the data storage means by facsimile. If, Ru can be configured to include a.

In the above communication apparatus, the first wireless communication method may employ a method of performing wireless communication by a direct spreading method, and the second wireless communication method may be a method of performing wireless communication by a frequency hopping method. Ru can be employed.

1 is a block diagram illustrating a configuration of a communication system 1. FIG. It is a ladder chart showing the communication mode at the time of FAX reception. 4 is a flowchart illustrating a reception handling process executed by a control unit 20. It is a flowchart showing the transfer reception process which the control part 40 performs. It is a flowchart showing the key reception display process which the control part 60 performs. It is a ladder chart showing the communication mode at the time of FAX transmission. 4 is a flowchart showing a facsimile data transfer process executed by a control unit 40. It is a flowchart showing the key input reception process which the control part 60 performs. It is a flowchart showing the transfer reception process which the control part 20 performs. It is a block diagram showing the structure of the communication system 100 of a modification. It is a figure showing the communication mode at the time of FAX reception and FAX transmission in a modification. It is a flowchart showing the transfer reception process of the modification which the control part 40 performs. 10 is a flowchart showing a facsimile data transfer process of a modification executed by the control unit 40.

Embodiments of the present invention will be described below with reference to the drawings.
(1) Overview of Communication System 1 FIG. 1 is a block diagram showing a configuration of a communication system 1 to which the present invention is applied. The communication system 1 according to the present embodiment includes a communication BOX 10 that is a communication device connected to a public telephone line network (PSTN), a digital multi-function device (multifunctional device) 30 that can wirelessly communicate with the communication BOX 10, and a communication BOX 10. A cordless telephone 50 capable of wireless communication.

The communication BOX 10 can wirelessly communicate with the NCU 11 connected to the public telephone line network, the FAX modem 12 capable of performing facsimile communication with the external facsimile apparatus 3 through the NCU 11, and each node constituting the wireless LAN (that is, wireless LAN communication is possible). WLAN communication unit 14 that is a simple communication interface, DCL communication unit 15 that is a communication interface capable of wireless communication with cordless telephone 50, operation unit 17 that includes an operation key group and functions as an input interface that can be operated by a user, and liquid crystal The display part 19 comprised with a display etc. and the control part 20 are provided.

  The control unit 20 includes a CPU 21, a ROM 23 that stores various programs executed by the CPU 21, and a RAM 25 that is used as a work area when the programs are executed. The communication BOX 10 includes a memory backup battery (not shown), and is configured to be able to retain data stored in the RAM 25 even after the communication BOX 10 is powered off.

  The control unit 20 of the communication BOX 10 stores facsimile data received from the external facsimile apparatus 3 through the NCU 11 and the FAX modem 12 in the RAM 25 by executing a program in the CPU 21, and follows a transfer instruction input from the user through the operation unit 17. The encrypted data obtained by encrypting the facsimile data received from the external facsimile apparatus 3 is transmitted to the multi-function device 30 through the WLAN communication unit 14. Further, every time encrypted data is transmitted, a decryption key for decrypting the encrypted data is transmitted to the cordless telephone 50 through the DCL communication unit 15.

  In addition, the control unit 20 decrypts the encrypted data obtained by encrypting the facsimile data to be transmitted received from the multifunction device 30 through the WLAN communication unit 14 with the decryption key received from the cordless telephone 50 through the DCL communication unit 15. The facsimile data after decryption is transmitted to the external facsimile apparatus 3 having the telephone number indicated by the facsimile data through the FAX modem 12 and the NCU 11.

  On the other hand, the multifunction machine 30 has the same communication interface as the WLAN communication unit 14 included in the communication box 10 and the reading unit 31 that optically reads a document, the printing unit 32 that forms an image on a sheet (paper), and the communication box 10. A WLAN communication unit 34 capable of wireless communication, an operation unit 37 that includes an operation key group and functions as an input interface that can be operated by a user, a display unit 39 that includes a liquid crystal display, and a control unit 40.

  The control unit 40 includes a CPU 41, a ROM 43 that stores various programs executed by the CPU 41, and a RAM 45 that is used as a work area when the CPU 41 executes the programs. Similar to the communication BOX 10, the multifunction machine 30 also includes a memory backup battery (not shown), and is configured to be able to retain data stored in the RAM 45 even after the multifunction machine 30 is powered off.

  The control unit 40 of the multifunction machine 30 receives the encrypted data from the communication BOX 10 through the WLAN communication unit 34 by executing a program in the CPU 41, and decrypts the encrypted data through the operation unit 37. And decrypting the received encrypted data with the obtained decryption key. Then, the facsimile data obtained by the decryption is stored in the RAM 45, and when a facsimile data print instruction is input from the user through the operation unit 37, the facsimile data instructed to be printed is read out from the RAM 45, and the facsimile data is read out. Then, a process of printing out through the printing unit 32 is performed.

  In addition, when an instruction for reading a document is input through the operation unit 37, the control unit 40 optically reads the document through the reading unit 31 and stores read image data representing the reading result in the RAM 45.

  When a facsimile transmission instruction is input through the operation unit 37, the read image data stored in the RAM 45 is converted into facsimile data including information on the destination telephone number, and the facsimile data is encrypted. The converted data is transmitted to the communication BOX 10 through the WLAN communication unit 34. In addition, with the transmission of the encrypted data, a process for displaying a decryption key for decrypting the encrypted data on the display unit 39 is performed. The decryption key displayed on the display unit 39 is input to the cordless telephone 50 by a user input operation, and is transmitted to the communication BOX 10 through the cordless telephone 50.

  The cordless telephone 50 includes a voice input / output unit 51, a DCL communication unit 55 that is a communication interface capable of wireless communication with the DCL communication unit 15 included in the communication BOX 10, and an input interface that can be operated by a user by including a group of operation keys. A functioning operation unit 57, a display unit 59 composed of a liquid crystal display or the like, and a control unit 60 are provided.

  The voice input / output unit 51 includes a microphone for collecting user's uttered voice, and also uses the external telephone device 5 transmitted from the external telephone device 5 via the communication BOX 10 to utter the voice and ringing sound of the user. Etc. are provided.

  The control unit 60 includes a microcomputer (not shown), and is configured to perform overall control of the entire cordless telephone 50 by executing various programs using the microcomputer. When receiving the decryption key from the communication BOX 10, the control unit 60 causes the display unit 59 to display it. When a display instruction for the decryption key input screen is input through the operation unit 57, the decryption key input screen is displayed on the display unit 59. When a decryption key is input through an operation through the operation unit 57, the input decryption is performed. The key is transmitted to the communication BOX 10 through the DCL communication unit 55.

In the communication system 1 of the present embodiment, the WLAN communication units 14 and 34 perform wireless communication by a direct spreading method according to a well-known wireless LAN standard (IEEE802.11x). On the other hand, the DCL communication units 15 and 55 are configured to perform wireless communication with an original specification (original protocol). Specifically, the DCL communication units 15 and 55 are configured to perform communication by a frequency hopping method in the present embodiment.
(2) Processing at the time of FAX reception Next, processing at the time of FAX reception executed in the communication system 1 will be described. FIG. 2 is a ladder diagram showing an outline of processing executed by each of the communication BOX 10, the multifunction device 30, and the cordless telephone 50, and signals transmitted / received between the communication BOX 10, the multifunction device 30, and the cordless telephone 50 during FAX reception. It is a chart.

FIG. 3 is a flowchart showing a reception handling process that is repeatedly executed by the control unit 20 of the communication BOX 10 to process facsimile data transmitted from the external facsimile apparatus 3, and FIG. FIG. 5 is a flowchart showing key reception display processing repeatedly executed by the control unit 60 of the cordless telephone 50. FIG.
(2-1) Reception Correspondence Processing The control unit 20 of the communication BOX 10 stores the facsimile data transmitted from the external facsimile apparatus 3 in the RAM 25 by repeatedly executing the reception correspondence processing shown in FIG. In accordance with the transfer instruction, the facsimile data stored in the RAM 25 is transferred to the multifunction machine 30.

Specifically, when this reception handling process is executed, the control unit 20 determines whether or not facsimile data is received from the external facsimile apparatus 3 through the FAX modem 12 (S110), and the facsimile data is not received. (No in S110), the process proceeds to S130. On the other hand, if facsimile data has been received (Yes in S110), the process proceeds to S120, the received facsimile data is stored in the RAM 25, and then the process proceeds to S130.

  When the process proceeds to S130, the control unit 20 determines whether or not an instruction to transfer facsimile data from the user to the multifunction device 30 is input through the operation unit 17, and if no transfer instruction is input (No in S130). Terminates the reception handling process.

  On the other hand, when a transfer instruction is input (Yes in S130), the process proceeds to S140, and the transfer target facsimile data instructed by the user through the operation unit 17 is read from the RAM 25, and the facsimile data is randomly selected. By encrypting based on the generated encryption key, the facsimile data is converted into encrypted data, and a decryption key for decrypting the encrypted data is generated. In the present embodiment, it is assumed that the combination of the encryption key and the decryption key is randomly generated for each execution in S140.

  When this processing is completed, the control unit 20 proceeds to S150, and transmits a facsimile data transmission that is a signal indicating the data size of the encrypted data generated in S140 and that can be used to send facsimile data. The permission inquiry is transmitted to the multifunction device 30 through the WLAN communication unit 14.

When a facsimile data transmission permission inquiry is transmitted by the processing of S150, a response signal is transmitted from the multifunction device 30 in a state where normal wireless LAN communication is possible.
After transmitting the facsimile data transmission permission inquiry, the control unit 20 waits until the response signal is received, and if the response signal cannot be received for a predetermined time (No in S151), the retry process is performed a predetermined number of times. It is determined whether or not it has been executed (S153), and if it is determined that it has not been executed a predetermined number of times (No in S153), the process proceeds to S150, and a retry process is executed. That is, as a retry process, a process of transmitting a facsimile data transmission permission inquiry to the MFP 30 through the WLAN communication unit 14 is executed again.

  On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S153), the control unit 20 displays an error message on the display unit 19 (S155), and temporarily ends the reception handling process.

  In addition, when the response signal can be received within a predetermined time (Yes in S151), the control unit 20 determines whether or not the response signal received from the multi-function device 30 is a facsimile data transmission permission notification. Judgment is made (S157). The multifunction device 30 transmits a response signal indicating not only a facsimile data transmission permission notification that permits transmission of facsimile data, but also a memory full notification that the memory is full and the facsimile data cannot be received. .

  If the control unit 20 determines that the received response signal is a facsimile data transmission permission notification (Yes in S157), the control unit 20 proceeds to S160 and determines that the response signal is a memory full notification (No in S157). ), The process proceeds to S155, an error message is displayed on the display unit 19, and then the reception processing is temporarily terminated.

  After shifting to S160, the control unit 20 transmits the encrypted data generated in S140 to the multi-function device 30 through the WLAN communication unit 14. When the encrypted data is transmitted in this manner, a facsimile data reception completion notification, which is a response signal indicating that reception of the encrypted data has been completed, is transmitted from the multi-function device 30 in a state where normal wireless LAN communication is possible. Come.

  After transmitting the encrypted data, the control unit 20 waits until receiving this facsimile data reception completion notification. If the facsimile data reception completion notification cannot be received (No in S161), the control unit 20 performs a retry process. It is determined whether it has been executed a predetermined number of times (S163). If it is determined that it has not been executed a predetermined number of times (No in S163), the process proceeds to S160, and a retry process is executed. That is, as the retry process, the process of transmitting the encrypted data to the multifunction machine 30 through the WLAN communication unit 14 is executed again.

On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S163), an error message is displayed on the display unit 19 (S165), and the reception handling process is temporarily terminated.
In addition, when the facsimile data reception completion notification can be received (Yes in S161), the control unit 20 proceeds to S170 and transmits the decryption key generated in S140 to the cordless telephone 50 through the DCL communication unit 15. To do. When the decryption key is transmitted by the process of S170, in a state where normal communication is possible, the cordless telephone 50 transmits a decryption key reception completion notification, which is a response signal indicating that the reception of the decryption key is completed.

  Therefore, after transmitting the decryption key, the control unit 20 waits until receiving the decryption key reception completion notification, and when the decryption key reception completion notification cannot be received (No in S171), the retry process is performed. Is determined whether or not is executed a predetermined number of times (S173). If it is determined that it has not been executed a predetermined number of times (No in S173), the process proceeds to S170, and a retry process is executed.

On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S173), an error message is displayed on the display unit 19 (S175), and the reception handling process is temporarily terminated.
In addition, when the decryption key reception completion notification can be received (Yes in S171), the control unit 20 proceeds to S180, and displays a completion message indicating that the transfer of the facsimile data is normally completed, on the display unit 19. And the reception handling process is terminated.
(2-2) Transfer Acceptance Processing Next, transfer acceptance processing executed by the control unit 40 of the multifunction machine 30 will be described. The control unit 40 of the multifunction machine 30 receives the facsimile data transferred from the communication BOX 10 by repeatedly executing the transfer receiving process shown in FIG.

  When the transfer acceptance process is started, the control unit 40 waits until a facsimile data transmission permission inquiry is received from the communication BOX 10 through the WLAN communication unit 34 (S210). When the facsimile data transmission permission inquiry is received (Yes in S210), The process proceeds to S220.

  In S220, the subsequent processing from S230 to S295 is completed, such as receiving encrypted data to be transmitted by the communication BOX 10 and storing it in the RAM 45 based on the data size information indicated by the facsimile data transmission permission inquiry. It is determined whether there is sufficient free space in the RAM 45.

  If it is determined that there is not enough free space (No in S220), the memory full notification is transmitted to the communication BOX 10 that is the transmission source of the facsimile data transmission permission inquiry through the WLAN communication unit 34 (S225), and the transfer is performed. The acceptance process is temporarily terminated.

On the other hand, if it is determined that there is sufficient free space (Yes in S220), the control unit 40 transmits the facsimile data transmission permission notification to the communication BOX 10 that is the transmission source of the facsimile data transmission permission inquiry through the WLAN communication unit 34. (S230).

  When the facsimile data transmission permission notification is transmitted, the control unit 40 shifts to a reception standby state for encrypted data transmitted from the communication BOX 10 and receives the encrypted data from the communication BOX 10 through the WLAN communication unit 34 ( S240).

  If the encrypted data can be normally received (Yes in S250), the facsimile data reception completion notification is transmitted to the communication BOX 10 that is the transmission source of the encrypted data through the WLAN communication unit 34. Later (S260), the process proceeds to S270.

  On the other hand, if the encrypted data cannot be normally received from the communication BOX 10 by the retry process (No in S250), an error message is displayed on the display unit 39 (S255), and the transfer acceptance process is temporarily performed. finish.

  In addition, when the process proceeds to S <b> 270, the control unit 40 displays the decryption key input screen on the display unit 39 and waits until the decryption key is input through the operation unit 37 or a cancel operation is performed through the operation unit 37. (S271, S273).

If a cancel operation is performed (Yes in S273), the encrypted data received in S240 is discarded (S277), and the transfer acceptance process is temporarily terminated.
In contrast, when the decryption key is input through the operation unit 37, the control unit 40 attempts to decrypt the encrypted data using the input decryption key (S275). If the encrypted data can be successfully decrypted (Yes in S280), the facsimile data obtained by decrypting the encrypted data is stored in the RAM 45 (S290), and the facsimile data is stored. A completion message to the effect is displayed on the display unit 39 (S295). Thereafter, the transfer acceptance process is temporarily terminated.

In addition, when the encrypted data cannot be decrypted normally (No in S280), an error message is displayed on the display unit 39 (S285), and the process proceeds to S270. This prompts the user to input the correct decryption key.
(2-3) Transfer Acceptance Processing Next, the key reception display processing that is repeatedly executed by the control unit 60 of the cordless telephone 50 will be described with reference to FIG.

  When the key reception display process is started, the control unit 60 stands by until a decryption key is received from the communication BOX 10 through the DCL communication unit 55 (S310). When the decryption key is received, the decryption key reception completion notification is sent to the DCL communication. The data is transmitted to the communication BOX 10 that is the transmission source of the decryption key through the unit 55 (S320). When this process is completed, the received decryption key is displayed on the display unit 59 (S330), and the key reception display process is terminated.

  However, in S330, the decryption key may be notified to the user by outputting the decryption key by voice instead of displaying the received decryption key. Specifically, a ringing tone is output, and when the user performs an operation for responding to the call through the operation unit 57, the decoding key is repeatedly output through the audio input / output unit 51. However, in order to avoid the decryption key being known to a malicious one, it is preferable that the decryption key is output as a sound with a small volume.

In the present embodiment, the decryption key is notified to the user through the cordless telephone 50 as described above, and the encrypted data transmitted from the communication BOX 10 to the multifunction device 30 is input to the multifunction device 30 by the user. Is stored in the RAM 45 of the multifunction machine 30. The facsimile data stored in the RAM 45 in this way is printed out by the multi-function device 30 in accordance with a user's print instruction.
(3) Processing during FAX Transmission Next, processing during FAX transmission executed in the communication system 1 will be described. FIG. 6 is a ladder diagram showing an overview of processing executed by each of the communication BOX 10, the multifunction device 30, and the cordless telephone 50 during FAX transmission, and signals transmitted and received between the communication BOX 10, the multifunction device 30, and the cordless telephone 50. It is a chart.

7 is a flowchart showing a facsimile data transfer process executed by the control unit 40 of the multifunction machine 30 when a facsimile transmission instruction is input through the operation unit 37. FIG. 8 shows a display instruction for a decryption key input screen. 6 is a flowchart showing a key input acceptance process executed by the control unit 60 of the cordless telephone 50 when the key is input through the operation unit 57. FIG. 9 is a flowchart showing a transfer acceptance process executed by the control unit 20 of the communication BOX 10 for facsimile transmission of facsimile data transferred from the multifunction machine 30 to the external facsimile apparatus 3.
(3-1) Facsimile Data Transfer Processing When a facsimile transmission instruction is input through the operation unit 37, the control unit 40 of the multifunction machine 30 starts facsimile data transfer processing shown in FIG. Then, the read image data representing the read result of the document instructed to be transmitted is converted into facsimile data (image data for FAX transmission) including information on the destination telephone number designated together with the transmission instruction (S410).

  When this processing is completed, the control unit 40 converts the facsimile data into encrypted data by encrypting the facsimile data using a randomly generated encryption key, and decrypts the encrypted data. The decryption key is generated (S420). In the present embodiment, the combination of the encryption key and the decryption key is randomly generated for each execution in S420.

  When the processing in S420 is completed, the control unit 40 sends a facsimile data transmission permission inquiry for inquiring whether or not facsimile data can be transmitted as a signal indicating the data size of the generated encrypted data. The data is transmitted to the communication BOX 10 through the unit 34 (S430).

  After transmitting the facsimile data transmission permission inquiry, the control unit 40 waits until a response signal is received from the communication BOX 10 through the WLAN communication unit 34 (S431), and the response signal cannot be received even after waiting for a predetermined time. If it is determined (No in S431), it is determined whether the retry process has been executed a predetermined number of times (S433). If it is determined that it has not been executed a predetermined number of times (No in S433), the process proceeds to S430, and a retry process is executed.

  On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S433), an error message is displayed on the display unit 39 (S435), and the facsimile data transfer process is terminated.

  In addition, if the response signal can be received within a predetermined time (Yes in S431), it is determined whether or not the response signal received from the communication BOX 10 through the WLAN communication unit 34 is a facsimile data transmission permission notification. Judgment is made (S437).

  If the control unit 40 determines that the received response signal is a facsimile data transmission permission notification (Yes in S437), the control unit 40 proceeds to S440 and determines that the received response signal is a memory full notification (S437). No), the process proceeds to S435, an error message is displayed on the display unit 39, and the facsimile data transfer process is terminated.

When the process proceeds to S440, the control unit 40 transmits the encrypted data generated in S420 to the communication BOX 10 through the WLAN communication unit 34.
After transmitting the encrypted data, the control unit 40 waits until the facsimile data reception completion notification is received (S441), and when the facsimile data reception completion notification cannot be received (No in S441). Then, it is determined whether the retry process has been executed a predetermined number of times (S443). If it is determined that it has not been executed a predetermined number of times (No in S443), the process proceeds to S440, and a retry process is executed.

  On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S443), an error message is displayed on the display unit 39 (S445), and the facsimile data transfer process is terminated.

In addition, when the facsimile data reception completion notification can be received (Yes in S441), the control unit 40 proceeds to S450, displays the decryption key generated in S420 on the display unit 39, and then The facsimile data transfer process ends.
(3-2) Key Input Accepting Process Subsequently, a key input accepting process (see FIG. 8) executed by the control unit 60 of the cordless telephone 50 when an instruction to display a decryption key input screen is input through the operation unit 57. To do.

  When the key input acceptance process is started, the control unit 60 displays a decryption key input screen on the display unit 59 in accordance with the display instruction (S510), and whether the decryption key is input through the operation unit 57 or the operation unit 57. The process waits until a cancel operation is performed through (S520, S530).

  When a cancel operation is performed (Yes in S530), the key input acceptance process is terminated. On the other hand, when a decryption key is input through the operation unit 57 (Yes in S520), the input decryption key is transmitted to the communication BOX 10 through the DCL communication unit 55 (S540).

  When the decryption key is transmitted by the process of S540, a response signal is transmitted from the communication BOX 10 in a state where normal communication is possible. Therefore, after transmitting the decryption key, the control unit 60 waits until a response signal is received through the DCL communication unit 55 (S541). If the response signal cannot be received (No in S541), the retry is performed. It is determined whether the process has been executed a predetermined number of times (S543). If it is determined that it has not been executed a predetermined number of times (No in S543), the process proceeds to S540, and a retry process is executed.

On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S543), an error message is displayed on the display unit 59 (S545), and the key input acceptance process is terminated.
In addition, when the response signal can be received (Yes in S541), the control unit 60 determines whether or not the received response signal is a decryption key reception completion notification (S550). From the communication BOX 10, a decryption key reception completion notification that is a response signal indicating that reception of the decryption key is completed as the response signal, or that the encrypted data cannot be decrypted normally with the received decryption key. A decoding error notification as a response signal is transmitted.

  If it is determined that the received response signal is a notification of completion of reception of the decryption key (Yes in S550), a completion message indicating that reception of the decryption key has been completed is displayed on the display unit 59 (S555). The input acceptance process ends.

  On the other hand, if it is determined that the received response signal is a decryption error notification (No in S550), the control unit 60 displays an error message for requesting to input a correct decryption key on the display unit 59 (S560). ), The process proceeds to S510.

In this way, the cordless telephone 50 acquires the decryption key displayed on the display unit 39 of the multifunction machine 30 through the user, and inputs the decryption key to the communication BOX 10 through the DCL communication unit 55.
(3-3) Transfer Acceptance Processing Next, the transfer acceptance processing repeatedly executed by the control unit 20 of the communication BOX 10 will be described with reference to FIG.

  When this transfer acceptance process is executed, the control unit 20 waits until a facsimile data transmission permission inquiry is received from the multi-function device 30 through the WLAN communication unit 14 (S610). When the facsimile data transmission permission inquiry is received (Yes in S610). , The process proceeds to S620.

  When the process proceeds to S620, a series of processes (S630) until the MFP 30 receives the encrypted data to be transmitted and transmits it to the external facsimile apparatus 3 based on the data size information indicated by the facsimile data transmission permission inquiry. It is determined whether or not there is sufficient free space in the RAM 25 to execute the processing of .about.S695.

  If it is determined that there is not enough free space (No in S620), the memory full notification is transmitted to the MFP 30 that is the transmission source of the facsimile data transmission permission inquiry through the WLAN communication unit 14 (S625). The transfer acceptance process is temporarily terminated.

  On the other hand, if it is determined that there is sufficient free space (Yes in S620), the facsimile data transmission permission notification is transmitted to the multifunction machine 30 that is the transmission source of the facsimile data transmission permission inquiry (S630).

  When the facsimile data transmission permission notification is transmitted, the control unit 20 shifts to a reception standby state for the encrypted data transmitted from the multifunction device 30 and receives the encrypted data from the multifunction device 30 through the WLAN communication unit 14. Then, it is temporarily stored in the RAM 25 (S640).

  When the encrypted data can be normally received (Yes in S650), the facsimile data reception completion notification is transmitted to the MFP 30 that is the transmission source of the encrypted data through the WLAN communication unit 14. (S660), the process proceeds to S670.

  On the other hand, when the encrypted data cannot be normally received from the multifunction machine 30 even by the retry process (No in S650), an error message is displayed on the display unit 19 (S655), and the transfer acceptance process is performed. Exit once.

  In addition, when the process proceeds to S670, the control unit 20 waits until a decryption key is received from the cordless telephone 50 through the DCL communication unit 15 or a cancel operation is performed through the operation unit 17 (S670, S675).

When the cancel operation is performed (Yes in S675), the encrypted data received in S640 is discarded (S677), and the transfer acceptance process is temporarily ended.
On the other hand, when the decryption key is received from the cordless telephone 50 through the DCL communication unit 15, the control unit 20 attempts to decrypt the encrypted data using the received decryption key (S680).
).

  If the encrypted data can be successfully decrypted (Yes in S681), a decryption key reception completion notification is transmitted to the cordless telephone 50 that is the decryption key transmission source through the DCL communication unit 15 (S690). . Then, the facsimile data obtained by decrypting the encrypted data and temporarily stored in the RAM 25 by the processing of S680 is read from the RAM 25, and the destination telephone number indicated by the facsimile data is read out from the RAM 25. Facsimile transmission to the external facsimile apparatus 3 corresponding to 1 through the FAX modem 12 and the NCU 11 (S695). Thereafter, the transfer acceptance process is temporarily terminated.

On the other hand, if the encrypted data cannot be decrypted normally (No in S681), the control unit 20 proceeds to S685 and sends a decryption error notification via the DCL communication unit 15 to the decryption key transmission source. Send to cordless telephone 50. Thereafter, the process proceeds to S670.
(4) Effects, etc. The configuration and operation of the communication system 1 of the present embodiment have been described above. In this communication system 1, the transmission BOX 10- A decryption key for decrypting encrypted data is exchanged between the cordless telephones 50. For this reason, the leakage of the decryption key can be firmly prevented. As a result, even if encrypted data transmitted / received between the transmission BOX 10 and the multifunction device 30 according to the wireless LAN standard is leaked, the possibility that the encrypted data is decrypted can be reduced.

  In addition, since this communication system 1 generates an individual decryption key each time encrypted data is generated, it is possible to prevent leakage of the decryption key more firmly than when a fixed key is used as the decryption key.

  In addition, in the communication system 1 of the present embodiment, the decryption key is notified to the user through the portable cordless telephone 50, and further, the decryption key information is acquired from the user. Therefore, the user does not need to move to the installation location of the communication BOX 10 and input the decryption key at the time of FAX transmission, and at the time of FAX reception, while watching the decryption key displayed on the cordless telephone 50 in front of the multifunction machine 30. The decryption key can be easily input to the multifunction machine 30.

  Therefore, according to the communication system 1 of the present embodiment, the decryption key input operation can be simplified, and the facsimile data is transmitted and received between the communication BOX 10 and the multifunction device 30 with high convenience and high confidentiality. be able to.

  As a result, according to the present embodiment, the data communication between the communication BOX 10 and the multi-function device 30 can be practically performed wirelessly, and the degree of freedom of installation of the multi-function device 30 can be increased as compared with the prior art. This makes it possible to provide the multifunction device 30 that is highly convenient.

In this embodiment, facsimile data can be transmitted with high confidentiality from the communication BOX 10 to the multifunction device 30 according to the wireless LAN standard. For example, the communication BOX 10 connects the facsimile data together with the multifunction device 30 to the wireless LAN. It may be configured to transmit to a personal computer or the like of the user. In this case, the user can manage the facsimile data as electronic data instead of a paper medium in the personal computer, and convenience is improved. That is, in this embodiment, by adopting a wireless LAN as a communication path for facsimile data, the communication BOX 10 and the multifunction machine 30 can be incorporated into an existing wireless LAN, and a highly convenient service is provided to the user. be able to.
(5) Correspondence Relationship The correspondence relationship between the communication system 1 of the present embodiment described above and “Claims” is as follows. The transmission device in the communication system according to claim 1 corresponds to the communication BOX 10 at the time of FAX reception, the first reception device corresponds to the multi-function device 30, and the second reception device corresponds to the cordless telephone 50. The first transmission unit corresponds to the WLAN communication unit 14, and the second transmission unit corresponds to the DCL communication unit 15. Further, the encryption means is realized by the process of S140 executed by the control unit 20, the first transmission control means is realized by the process of S160, and the second transmission control means is realized by the process of S170.

  Also, the receiving means provided in the first receiving device corresponds to the WLAN communication unit 34, the key obtaining means is realized by the processing of S270 to S273 that obtains the decryption key through the operation unit 37, and the decryption means is S275. This process is realized. Further, the data storage means is realized by S290 and the RAM 25.

  In addition, the receiving means included in the second receiving apparatus corresponds to the DCL communication unit 55, and the notification unit is realized by the processing of S330 executed by the display unit 59, the voice input / output unit 51, and the control unit 60. .

(6) Modified Example Next, a communication system 100 according to a modified example will be described. However, the communication system 100 according to the modified example is one in which the multi-function device 30 and the cordless telephone 50 constituting the communication system 1 according to the above embodiment are integrated (see FIG. 10). That is, the communication BOX 10 has the same configuration as that of the communication system 1 except that a signal such as a decryption key is transmitted and received through the DCL communication unit 15 with the multifunction device 130 as a communication partner instead of the cordless telephone 50. Therefore, in the following, description of the communication BOX 10 is omitted, and a configuration different from the communication system 1 is selectively described as the configuration of the multifunction machine 130.

FIG. 10 is a block diagram illustrating a configuration of a communication system 100 according to a modification. As illustrated in FIG. 10, the communication system 100 according to the modification includes a communication BOX 10 and a multifunction device 130, and the multifunction device 130 includes a reading unit 31, a printing unit 32, a WLAN communication unit 34, and DCL communication. Unit 135, operation unit 37, display unit 39, handset 137, ringing tone output speaker 139, and control unit 40. That is, the multifunction device 130 is configured to be able to wirelessly communicate with the communication BOX 10 through the WLAN communication unit 34, and is configured to be capable of wireless communication with the communication BOX 10 through the DCL communication unit 135.

  FIG. 11A is an explanatory diagram illustrating a communication mode at the time of FAX reception in the communication system 100, and FIG. 11B is an explanatory diagram illustrating a communication mode at the time of FAX transmission in the communication system 100.

  As shown in FIG. 11A, in the communication system 100, facsimile data received at the time of FAX reception is encrypted and transmitted from the WLAN communication unit 14 of the communication BOX 10 to the multi-function device 130. A decryption key for decrypting the encrypted data is transmitted from the DCL communication unit 15 of the communication BOX 10 to the multifunction device 130.

  In the MFP 130, the encrypted data received by the WLAN communication unit 34 is decrypted by the decryption key received by the DCL communication unit 135, and the decrypted facsimile data is stored in the RAM 45.

  On the other hand, at the time of FAX transmission, as shown in FIG. 11B, the facsimile data to be transmitted is encrypted and transmitted to the communication BOX 10 from the WLAN communication unit 34 of the multifunction machine 130, and this encrypted data is decrypted. Is transmitted from the DCL communication unit 135 of the multifunction machine 130 to the communication BOX 10.

  Specifically, in this modification, the control unit 40 of the multi-function peripheral 130 realizes the above operation at the time of FAX reception by executing the transfer reception process shown in FIG. 12 instead of the transfer reception process of FIG. .

  When the transfer acceptance process illustrated in FIG. 12 is started, the control unit 40 executes the processes of S210 to S260 as in the above-described embodiment. In S260, when the facsimile data reception completion notification is transmitted to the communication BOX 10 through the WLAN communication unit 34, the processes after S710 are executed.

  After shifting to S710, the control unit 40 shifts to a reception waiting state for the decryption key transmitted from the communication BOX 10, and receives the decryption key from the communication BOX 10 through the DCL communication unit 135.

  When the decryption key is successfully received (Yes in S720), a decryption key reception completion notification is transmitted to the communication BOX 10 that is the decryption key transmission source through the DCL communication unit 135 (S730), and the received decryption key is received. The encrypted data from the communication BOX 10 received in S240 is decrypted, and the facsimile data obtained by the decryption is stored in the RAM 45. Thereafter, a completion message indicating that the facsimile data has been saved is displayed on the display unit 39, and the transfer acceptance process is temporarily terminated.

  On the other hand, if the decryption key is not transmitted even after waiting for a predetermined time from the communication BOX 10 and reception of the decryption key fails (No in S720), the control unit 40 proceeds to S725 and displays an error message on the display unit 39. Then, the transfer acceptance process is temporarily terminated.

  Next, facsimile data transfer processing executed by the control unit 40 of the multifunction machine 130 during FAX transmission will be described. FIG. 13 is a flowchart showing a modified facsimile data transfer process executed when the control unit 40 of the multifunction device 130 receives a facsimile transmission instruction through the operation unit 37, instead of the facsimile data transfer process of FIG. is there.

When the facsimile data transfer process shown in FIG. 13 is started, the control unit 40 executes the processes of S410 to S445 as in the above-described embodiment. When the facsimile data reception completion notification is received from the communication BOX 10 (Yes in S441), the process proceeds to S810, and the decryption key for decrypting the encrypted data transmitted in S440 is transmitted to the communication BOX 10 through the DCL communication unit 135. Transmit (S810). When a decryption key is transmitted by the processing of S810, a decryption key reception completion notification is transmitted from the communication BOX 10 in a state where normal communication is possible.

  Therefore, after transmitting the decryption key, the control unit 40 waits until a decryption key reception completion notification is received through the DCL communication unit 135 (S820), and when the decryption key reception completion notification cannot be received (S820). It is determined whether the retry process has been executed a predetermined number of times (No in S820) (S830). If it is determined that it has not been executed a predetermined number of times (No in S830), the process proceeds to S810 and a retry process is executed.

  On the other hand, if it is determined that the retry process has been executed a predetermined number of times (Yes in S830), the control unit 40 displays an error message on the display unit 39 (S840) and ends the facsimile data transfer process.

  In addition, when the decryption key reception completion notification can be received (Yes in S850), the control unit 40 causes the display unit 39 to display a completion message indicating that the transfer of the facsimile data is completed (S850), The facsimile data transfer process ends.

Having described the communication system 100 of the modification, according to the modified example, since it is not necessary input operation of the decryption key to the user, you improving convenience.
(7) Others While the embodiments of the present invention including modifications have been described above, the present invention is not limited to the above-described embodiments, and can take various forms. For example, the communication system of the present invention can be applied not only to a system that transmits and receives facsimile data, but also to a system that transmits and receives various data.

DESCRIPTION OF SYMBOLS 1,100 ... Communication system, 3 ... External facsimile apparatus, 5 ... External telephone apparatus, 11 ... NCU, 12 ... FAX modem, 14, 34 ... WLAN communication part, 15, 55, 135 ... DCL communication part, 17, 37, 57 ... operation section 19, 39, 59 ... display section, 20, 40, 60 ... control section 21, 41 ... CPU, 23, 43 ... ROM, 25, 45 ... RAM, 30, 130 ... digital multifunction peripheral, 31 ... Reading unit, 32 ... Printing unit, 50 ... Cordless telephone, 51 ... Voice input / output unit, 137 ... Handset, 139 ... Speaker

Claims (4)

A communication system comprising: a transmission device; and first and second reception devices that receive data transmitted from the transmission device,
The transmitter is
A first transmission means for transmitting data in a first predetermined wireless communication method;
Second transmission means for transmitting data in a second wireless communication method different from the predetermined first wireless communication method;
Encryption means for encrypting data to be transmitted to the first receiving device;
First transmission control means for causing the first transmission means to transmit the transmission target data encrypted by the encryption means to the first receiving device;
Second transmission control means for causing the second transmission means to transmit a decryption key for decrypting the transmission target data encrypted by the encryption means to the second receiving device;
With
The first receiving device is:
Receiving means capable of receiving data transmitted from the first transmitting means provided in the transmitting device;
Key acquisition means for acquiring the decryption key through an input interface;
Based on the decryption key acquired by the key acquisition means, decryption means for decrypting the data received by the reception means of its own device;
Data storage means for storing data decoded by the decoding means;
With
The second receiving device is:
Receiving means capable of receiving data transmitted from the second transmitting means included in the transmitting device;
A notifying means for displaying or outputting a decryption key received by the receiving means of the own apparatus from the transmitting apparatus to a user who uses the second receiving apparatus;
With
The first wireless communication method is a method of performing wireless communication by a direct spreading method,
The second wireless communication method is a method of performing wireless communication by a frequency hopping method.
Communication system, characterized in that. The transmission device includes a facsimile communication means capable of communicating with an external facsimile device,
2. The communication system according to claim 1 , wherein the encryption means provided in the transmission apparatus is means for encrypting facsimile data received from an external facsimile apparatus by the facsimile communication means as the transmission target data. A transmitter that transmits data toward the first and second receivers included in the communication system according to claim 1,
A first transmission means for transmitting data in a first predetermined wireless communication method;
Second transmission means for transmitting data in a second wireless communication method different from the predetermined first wireless communication method;
Encryption means for encrypting transmission target data to be transmitted to the first transmission means;
First transmission control means for causing the first transmission means to transmit the transmission target data encrypted by the encryption means to the first receiving device capable of wireless communication by the first wireless communication method. When,
For each transmission of transmission target data encrypted by the encryption unit, the second transmission unit is provided with a decryption key for decrypting the transmission target data encrypted by the encryption unit. Second transmission control means for transmitting to the second receiving device capable of wireless communication in a wireless communication system;
With
The first wireless communication method is a method of performing wireless communication by a direct spreading method,
The second wireless communication method is a method of performing wireless communication by a frequency hopping method.
Transmission device comprising a call. A facsimile communication means capable of communicating with an external facsimile machine;
The transmission apparatus according to claim 3 , wherein the encryption means is means for encrypting facsimile data received by the facsimile communication means from an external facsimile apparatus as the transmission target data.

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