JPS6016146B2 - Communication method using digital random numbers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication system using digital random number synchronization when mobile stations transmit and receive digital code transmissions by multiplying random numbers for mutual secrecy over radio (communication) lines with poor transmission quality. .

Generally, when transmitting digital codes between multiple mobile stations scattered over a wide area over a wireless link with poor transmission quality such as a shortwave link, the transmission power on the transmitting station side must be increased and the original information must be transmitted in order to keep the content confidential. It is necessary to multiply the digital code by a random number and transmit it.

In such a case, if a random number addition method using a clock or a timer is used as in the present invention, the degree of secrecy can be increased with a small number of random number synchronization patterns, and random number synchronization between transmitting and receiving stations can be easily set. Therefore, according to the method of the present invention, it is easy to form a communication network between multiple mobile stations in a wide area, and even when there is a station that interrupts this communication network and performs transmission and reception, it is easy to set random number synchronization, etc. A remarkable effect can be obtained. In conventional communication systems, in order to improve the confidentiality of digital codes, the number of bits of the random number synchronization code for synchronizing random numbers between mobile stations is increased, and a random number method is used using random number synchronization codes that are sent out sequentially over time. However, on wireless lines with poor transmission quality, it is difficult to set up random number synchronization when transmitting and receiving data between mobile stations, making it almost impossible to form a communication network for multiple mobile stations. , and in order to do this, a complicated error control device is required, resulting in a complicated circuit configuration.Also, if a simple random number formula is adopted to facilitate random number synchronization between transmitting and receiving stations, the secrecy effect will be small and it may not be practical. There were many drawbacks.

The present invention was made to eliminate these drawbacks, and will be explained in detail below with reference to Examples. FIG. 1 is a diagram showing an example of the circuit configuration of a transmitting device and a receiving device used in a wireless line embodying the present invention.

The upper half of the figure shows the transmitter and antenna AT for transmitting random digital codes via a wireless line, and the lower half of the figure shows the random number synchronization of the random digital codes received by the antenna AR on the transmitting station side using the method of the present invention. This is a receiving device for translating and restoring the original information into a digital signal.In particular, the part surrounded by the broken line is a receiver that multiplies the digital code of the original information, which is important in the present invention, by a random number, translates it, and restores it. It is a circuit. In addition, Fig. 2 is a waveform diagram of each part of the transmitting device in Fig. 1, and Fig. 3 is a waveform diagram of each part of the receiving device in Fig. 1. It shows the waveform when the later received random number digital code is translated and restored to the digital code of the original information. First, the method of sending random number digital codes on the transmitting side will be explained.

In FIG. 1, reference numeral 1 denotes a (transmission) code processing unit (DTI), which is a circuit for synchronizing the time base with an interface circuit when a digital code of nuclear submarine information is input from an external terminal device (not shown). The digital signal of each frame or word processed here is output as a serial digital code, and at this time, a control signal indicating the delimitation of each frame is also output. FIG. 2 (1-T) shows the waveform of this output, and in this example, the original information SI, S2
,...S7,S8,S9,SI0,SI1,S
Although each of I2, . . . constitutes one frame, only the waveforms of S7, S8, and S9 are illustrated. Next, 2 is a synchronization code adding unit 1 (STI), which is a synchronization code (STI) for synchronizing frames between transmitting and receiving using input serial digital codes and control signals in units of one frame.
Bit synchronization (bit synchronization can be achieved if frame synchronization is achieved) is added to the front of each frame.

(2-T) in Fig. 2 is a waveform in which a synchronization code is added before each frame in this STI, and S7, S8, S
9, N in front of SIO is this synchronization code, but it has the same pattern for all frames, and in this example, it is 10110. ...[The binary number 11 is used. Next, 3 (CPTI), 4 (CPT2), 8 (CPT
3) and 6 (CPT4) are circuits that multiply the digital signal outputted from 2 (STI) by a random number, 9 is a random number control section 1 (CONTI), and 14 is a timer control section (TMI). These 9 and 14 are parts shared by the transmitting and receiving devices. Here, the use of random numbers in the present invention will be explained. A random number synchronization code B is changed at short intervals (for example, 1 minute or 1 hour) and a random number synchronization code B is changed at long intervals (for example, 3 minutes or 3 minutes).
Using a random number synchronization code A that is changed using a random number synchronization code A, the digital code of the original information is multiplied by a random number by a random number synchronization code B in a manner that does not increase or decrease bits. The method of multiplying is used. In this example, the long-term random number synchronization code A is composed of 10 binary bits; ;10
You can create 24 different patterns. Figure 4 shows m~(102
4) 10-bit configuration 1024-fold random number synchronization code A
5-bit configuration of binary code from and to (32) = 32
The random number synchronization code B of the pupils is shown. Now, before we start transmitting and receiving random number digital codes, we must first decide in advance which random number synchronization codes will be adopted and in what order they will be sent.
The transmitting and receiving stations are set in the same way using a digital switch (a commercially available and well-known product) provided in the random number control unit 1 or 9 (CONTI) shown in the figure. FIG. 5 is an external view of this digital switch, where x is a switch for long-term random number synchronization code A, Y is a switch for short-time random number synchronization code B, and Z is a timer to be described later. In this way, X, Y
How the random number synchronization codes A and B respectively set by the switches are changed over time will be explained in detail with reference to FIG. 6. FIG. 6 is an explanatory diagram of changes in the random number synchronization code.

In Fig. 6a, M wide out of 1024 kinds of random number synchronization codes A,
, M wide 2, Mx3, M round...
Assume that the Nx2 and Nume patterns are set using the Y switch. In Figure 6a, the random number synchronization code A sends Mk, (pattern) at a, in the direction of the arrow outside the great circle as time passes, then Mk2 at a2, Mk3 at a3, a
In step 4, each pattern of M&, . Here a,, a2...
indicates the determined position of the random number synchronization code A in the transmission code. [Please refer to (31T) and (41T) in the explanation in Figure 2] Also, the transmission applications for random number synchronization code B are 1, 2,
3...Make sure that n small circles go around the large circle. For example, in the small circle of 1, in the direction of the arrow inside the circle, b, [this is a
, immediately after sending out the Mx pattern, Fig. 2 (4-T)
]Nx, pattern is sent out, then b, 2 and N
Also, if you send out Nume at q3 and return to b, again (b, .
, b, 2, etc. are the determined positions of the random number synchronization code B)
Send Mx2 at position a2 of the large circle, then b at the small circle of 2
2, Nx, b22, Nx3, and so on. Thus, in the large circle a, the time from sending out M until moving to a2 is the same as the time required to go around the small circle of 1, and similarly, after sending out Mx2 at a2, it moves to a3. The time it takes is equal to the time it takes to go around two small circles, and so on. According to the above method, the way in which the digital code of the original information is multiplied by random numbers (actually, the content or pattern of the added random numbers) changes every time the random number synchronization codes A and B change.

For example, before moving from a3 to a4 of the large circle, the original information digital code is multiplied by a random number by a random number synchronization code B of Nx from the small circle wide to Q2, and similarly from wide 2 to Q3, N random numbers are applied. Using the synchronization code B, random numbers are multiplied by N random numbers from wide 3 to wide, respectively using the synchronization code B. Then, the code B of one circumference of the small circle and the digital code multiplied by this random number are further multiplied by a random number Mx3 of the code A, so the small circles 1 to n in FIG. changes with changes in FIG. 6b shows the process in which the random number synchronization code B actually changes with the passage of time, and it is assumed that the way the random number synchronization code A is added to the passage of time is the same as in FIG. 6a.

That is, before moving from a to a2 in Figure 6a, the random number synchronization code B of small circle 1 is Nx, N&, Nx3, and in Figure b, the code A is Mx, so the random number synchronization code B' of small circle 11 is (It is expressed as B' to distinguish it from B above, but B may also be used.) , Nx,2, Nx,3. Moreover, as mentioned above, since the method of the present invention is a random number formula with no bit increase or decrease, random number synchronization codes A, B, B' are used in a and b in FIG.
The temporal change position of is the same. Similarly, 4 in figure a
・Random number synchronization code 8 of circles 2, 3...n Nx,,N pond,
Nx3 actually changes as the random number synchronization code A changes as follows: Change it as follows: ume 2, Nx mother, small circle 41 N&,, N yen 2, N yen 3. In this way, the first three types of random number synchronization codes B are further multiplied by random numbers by the random number synchronization code A, and as a result, the random number synchronization codes B increase to up to 32 B' codes.
In other words, even if the digital code of the original information is multiplied by a random number using the same random number synchronization code B as shown in Figure 6a, the actually transmitted random number digital signal will have a pattern obtained by multiplying the random numbers using the same method as shown in Figure 6b. Since it is never sent out and is multiplied twice by random numbers, the degree of secrecy is extremely high.
The transmitting and receiving stations are also equipped with clocks or timers, as shown at 14 in FIG. put.

The transmission position of the random number synchronization code A over time, for example, the position of any arc of the breakpoints of a, a2, a3...an of the large circle or 11, 21, 3 of the small circle in Fig. 6b.
1... Make sure that the transmitting and receiving station can determine without error whether the random number is multiplied at the nl position using this timer or clock. (This will be explained in the section below.) Z in Fig. 5 is a clock or timer 14 (TMI) that operates continuously after the random number synchronization code A starts to be transmitted, and it starts at the transmitting and receiving station at the time of transmission/reception agreement, for example, at 8 am. What was 000000 at that time was displayed as 103015 on both the transmitting and receiving stations at 1:30 am on the same day. Note that the display method may be either the 1G system or the binary system, and clocks and timers must be equipped with a power outage countermeasure such as a battery so that they continue to operate even if the power to the device is turned off. These units continue to operate (count) even when the receiving side does not start receiving. Now, returning to FIG. 1 again, a method of transmitting an actual random number digital code as shown in FIG. 2 over a wireless line will be explained.

First of all, from the above explanation, Figure 2 is from a3 to a of Figure 6b.
This shows the output waveforms up to 5. 3 in Figure 1
(CPTI) is the timer control unit 14 (T
Random number synchronization code A (Mx, , Mx2, M
x3,...Mkn). That is, as shown in FIG. 2 (3-T), random number synchronization codes are added at regular intervals according to the rules agreed upon in advance between the transmitting and receiving stations. In addition, in the (3-T) waveform, N, S7, N, S
M3 (1001010111)...[2' of the random number synchronization code A is added before the digital signals of 8, N, S9, and M is added before the next digital signals of N, SI0,... (1101010010)...'2) is added. As described above, the type of pattern of the random number synchronization code A and its order are set by the digital switch X shown in FIG. 5 provided in the random number control section 9.
Next, this signal indicated by (3-T) is input to the random number transmitting section 2, that is, 4 (CPT2) in FIG.

At CPT2, the synchronization code N of the digital code of the information is changed to a random number synchronization signal B (Nx, N&, Nsugi) according to the pattern set by the digital switch Y in FIG. FIG. 11 shows this control signal given from CONTI 9. The output of CPT2 is shown in Fig. 2 (4-T), but in (4-T), the digital codes S7, S8, S9 of the original information, and the synchronization code N (10110) are also the settings in Fig. 5 Y. Nx of Tozuku random number synchronization code B, (0110
0)...'3', N plum (11011)...'4',
N (00100)...'5} has been changed. Similarly, the synchronization period codes N of the next SI0, SI1, and S12 are similarly changed to Nx, , Nx2, and Nume. The output of CPT2 is input to the random number transmitter 3 (CPT3) in FIG.
Here, the above random number same number code B (Nx,, N average, Nx3)
The original information digital code for each frame is multiplied by a random number.

This control signal is shown as input 12 from random number control section 9. (5-T) in FIG. 2 is the output waveform of CPT3, for example, the digital code S7(10
1001101100100)…■, S 8 (0110
10011101100)...{7), S
9 (101010000100011)...■ is Sx7 (001101011001101) by Nx,, Nx2, Nx3 of random number synchronization code B, respectively.
)． ．． ．． ■ , Sx8 (00111011011
1001)...OQ, Sx9(110001
110010110)...,,.
This method of change is shown in an example of changing from S7 to Sx7. Since this random number synchronization code is Nx, the random number addition pattern (100100110101001) determined by Nx is included inside 5 (CPT3) in Fig. 1...
. That is,
S rights, Sx9, Sx,.

. . . etc. are also changed using the same method. In this way, when the code (5-T) is generated by CPT3 in FIG. 1 and input to 6 (CPT4), which is the random number transmitter 4 in the next stage,
In this stage, every time the random number synchronization code A is inputted by the control signal 13 from the random number control unit 9 for the input (5-T) code in FIG. 2, the subsequent random number synchronization code B and this B' Therefore, the digital code that has been multiplied by a random number is multiplied again by a random number.

(6-T) in FIG. 2 is an example of the output waveform of CPT4 as a result. In this example, M of random number synchronization code A is also (10010
10111) ...■, the following Nx,, Sx7, N&, Sz, Nx3, Sx9 of (5-T) are N,
, For S? , Nyuzu2, S×38, N is also changed to 3, and S is also changed to 9. The method of this change is to prepare the Mk3 change pattern inside the CPT4 in the same way as the change using the random number synchronization code B described above, and perform binary addition to the signals after Mb3 input to the CPT4, as shown in Figure 2 (6-T). ) to create a random digital signal. The specific method of this change is as follows. The code after Mk3 of (5-T) is...(13), and the next random number addition pattern determined by Mx3 is CPT4
It is located inside.

0011001001110110010010010
1000100100010011000110101
0111001010...(1 core, and the input transmission pattern (13) and this (10) are added bit by bit in binary order to create the following random number digital code using Mk3.

For Mk4 and later, random number digital signals can be created by multiplying random numbers in the same manner.

7 (MODI) in FIG. 1 is a modulation unit for transmitting the digital signal (6-T) from the random number transmission unit 6 over a wireless line;
8 (TXI) is a transmission section (power amplification section), and a transmission wave subjected to, for example, phase shift modulation by a digital signal (6-T) in the modulation section 7 is radiated from the antenna AT.

Next, a method of receiving the above transmission signal, synchronizing the random numbers with the transmitting station, translating it, and restoring the original information to a digital code will be explained.

FIG. 7 is a diagram showing an example of the configuration of a communication network comprising a plurality of mobile stations in a wide area equipped with the device shown in FIG. As shown in this diagram, AI
, B1, B2, B3, and CI exist, and each of them is connected to X of the digital switch in Figure 5.
, Y, and Z settings are the same and the random number digital signals transmitted from the AI station are first considered when the mobile stations B1, B2, and B3 receive the random number digital signals through the radio lines 1, 2, and 3 in Fig. 7. do. First, the process will be explained with reference to FIG. 1, starting from synchronizing the receiving side with the random number synchronization of the transmitting station AI.

The signal received by the receiving side antenna AR is sent to the receiving section 15 (RX
After being selectively amplified by step I), it is demodulated by demodulator 16 (DEMI), and a random number digital code like (11R) in FIG. . This circuit 17 is a circuit for adjusting random number synchronization to the AI station in Figure 7. After starting reception at S in Figure 3 (1-R), the random number synchronization check starts from the position t, where the receiving device begins to stabilize. It shall be. At this time, the clocks or timers built in both the transmitting and receiving stations shown in FIG. 14 (TM,) show almost the same count according to the settings shown in FIG. 5 Z.

That is, t. of FIG. 3 (1-R). At the position, both the transmitting and receiving stations start at almost the same time, and as time passes, the temporal position of the random number synchronization code A, which changes over a long period of time, rises in the great circle in Figure 6b. Assume that it is between a3. This is shown in FIG. 14TM. Transmitting and receiving stations can be determined based on control signals. That is, it can be determined by a clock or a timer that the received random number digital code is a code obtained by multiplying the random number synchronous code A by a random number Mk2. Therefore a clock or timer 14
It is necessary that the accuracy is at least such that the position of the random number synchronization code A can be determined without error. Therefore, if the random number synchronization of the random number synchronization code B' can be set, it is possible to automatically and correctly adjust the random number synchronization on the transmitting side. By the way, the random number addition or translation pattern common to both transmitting and receiving stations for Mx2 (10010)...16 (the above-mentioned random number addition pattern is used on the transmitting side, and this pattern is subtracted from the received random number digital code on the receiving side for translation. ) is the pattern.

Also, as mentioned above, the random number synchronization code B established between the transmitting and receiving stations is 01100...■Nx2 is 11
011...■, Nx3 is 00100...'5-. The random number synchronization code B is multiplied by a random number by Mk2 and the transmitted pattern is added with 17 binary codes for Nx, Nx2, and Nx3, and the random number synchronization code B' becomes Nx. For N×a=01111...18, for Nx2, N-2=11100...19, for Nx3, N&
3=10100...20 can be determined on the receiving side. To explain this in more detail, the random number synchronization code B' for Mb2 of the random number synchronization code A can be determined by adding the translation pattern built in Figure 1 7 (CMYNCI) and the random number synchronization code B as follows. It is.

Therefore, by finding the breakpoints of patterns 18, 19, and 20 of the random number synchronization code B', random number synchronization can be achieved with the transmitting side.

Specifically, first, when the test start time t in Figure 3 (1-R) is received, the following 1st bit a is received and the previous 5 bits including this (random number synchronization code B, which refers to Irohania a in the figure, is 5). bit structure). At this time, Irohani a=01001, which is 1 of the random number synchronization code B'
Since it does not match any of 8, 19, and 20, a is code B.
It is not the last 5th bit of '. When the next bit b is checked in the same manner, the previous 5 bits including this are Rohani a
b=10011, which also does not match any of 18 to 20. After starting the test in this manner, it is checked whether or not each bit that is sequentially input is matched with the random number synchronization code B'. For example, when bit h is input, if you check the pattern of the previous 5 bits defgh including this bit, it will be 11100...
・21, which means that N of the random number synchronization code B' also matches the pattern 19 of 2, so this h bit is the final 5 of N even 2.
Determine it as the bit. Then, at the position t2 where the final 5th bit p of predicted Nx22 arrives (L3 where N is the bit length after 2), the previous 5 bits including this are somnop
=10100...22 is checked, and if it matches the Nx bad pattern 20, it is assumed that random number synchronization with the transmitting station has been set. In this way, the receiving station can determine the position of the pattern that is sequentially transmitted using the clock or timer for the random number synchronization code A (between Nk2 and Mume in the example in Figure 3), and then performs random number synchronization using this. Code B
’ reception pattern using random number synchronization code B (Nx, , Nx2,
Random number synchronization code B' (Nx3) and random number synchronization code B' (Nx22, Nx2) by adding the translation pattern to random number synchronization code A
If it is determined that two or more consecutively matching 5-bit patterns are found in the received digital code, this is set as the dividing point between the random number synchronization code B' and the digital information, and random number synchronization is set. Furthermore, depending on the starting position of the random number synchronization test of the receiving mobile station, for example, a match with the random number synchronization code B' is found consecutively in N-3 of Mx2 and N-kai of the next M-pine, and random number synchronization is set based on this. Sometimes. The above judgments and synchronization settings are automatically performed as long as the clock or timer is approximately correct. In this way, random number synchronization code A (in the above example, n types were selected out of 1024 types, n >> 3)
By using the method of the present invention, which transmits and receives digital code transmission multiplied by random numbers using random number synchronization code B, which has a shorter bit length and fewer types of patterns (in the above example, there are three types of 5 bits), the transmission quality can be improved. Random number synchronization can be easily performed even on poor wireless lines, and the circuit configuration is therefore simple.

If the count of the clock or timer on either side of transmitting or receiving deviates greatly and it is not possible to automatically set the random number synchronization between Mx2 and Mx3, for example, between the random number synchronization code A before and after this, for example Mx , and MK2 or between Mx3 and M
You can use the same method to set up random number synchronization between &, or you can inquire about the count from the transmitting station in advance, set a rough clock or timer, and then set up random number synchronization. Now, once the random number synchronization setting is performed at the position of Fig. 3 (1-R), from then on, the random number synchronization codes A and B'
The received random number digital code is translated in accordance with the random number rules preset between the receiving stations, that is, the settings of the X, Y, and Z switches shown in FIG. 5.

In this way, once the correct random number synchronization settings are made at the transmitting and receiving stations, as long as the stability of the crystal oscillator that determines the random number synchronization timing between the transmitting and receiving stations is good, the settings will be correct regardless of the transmission quality of the wireless line. Random number translation can be done. Figure 3 (2-R) is 18 in Figure 1, that is, the random number translation unit 1.
After t3 (1-R), which is input from the random number synchronization detection unit 17 in the previous stage in (CPRI), the random number synchronization code A (
Mume, Mk4,...Mbn), the random number synchronization code A in parentheses is removed, and the waveform is sequentially output to the next stage.
, Nx, Nx anchors are also translated into Nx, , N of random number synchronization code B sequentially at their pattern positions independently of the received code.

Also, of the received digital code Sx, Sx38, S 9
and Sx side, Sx4, . , S circle 22 is Mx8 and M
x4 gives Sx7, S & Sx9 and Sx, o, Sx,
．． , Sx,2. This method of translating the received digital code uses the translation pattern (random number addition pattern on the transmitting station side), that is, 0011001001 shown in the explanation of the transmitting device earlier, in order to translate the received digital code by Myuzu.
1101100100100101000100100
0100110001101010111001010
...(1 illusion is set at 18 (CPRI), the pattern of 14 is subtracted from the pattern of digital signals Sx37, Sx38, S and 9, and outputted to the next stage. This results in a power Sx7
, Sx8, Sx9. Subsequent digital codes are translated in the same manner. Furthermore, S cedar 7, Sx38, Sx
From 39 patterns (15) (using 1 core, Sx7, S
&, Sx9 may be subtracted as follows. The result is (see Summer 2017).Next, 19 in Figure 1, that is, the random number translation unit 2 (CPR2), synchronizes the random number synchronization code B from 18 (CPRI) and the digital information with the control signal 25 from 9 (CONTI). Code B(Nx,,N&,Nx3
) translation.

Figure 3 (3-R) is the resulting output waveform, (2-R)
Sx7, S for, Sx7 and Sx, o, Sx, . ,S
If x,2 is translated by Nx,,Nx2,Nx3,
S7, S8, S9 and S, o, S, . ,S,2 are obtained. To give a specific example, in order to translate Sx7 into S7, Nx is used in advance to convert the digital code Sx7 into a translation pattern (called a random number addition pattern in the transmitting device) 100100110101001...(12).
Sx7 (prepared inside 9 (CPR2) and input to this
001101011001101)...Subtract the pattern (12) from (23) and get S7=101001101
100100...(2 hearts are obtained. Next, 2 in Figure 1
0, that is, the random number translation unit 3 (CPR3) uses the random number synchronization code B (Nx,
, Nx2, Nx3) to match the frame synchronization or bit synchronization of the digital code of the petition line with the transmitting station side.
(CONT) by the control signal 26, the synchronization code N(1
0110)...Change to (1).

FIG. 3 (4-R) shows the waveform after this change, which is output to the next stage 21 (SRI). 21 (SRI) is a reception synchronization unit 1, and when the digital signal (41R) is input, it performs frame synchronization and bit synchronization with the transmitting station side with respect to the original information using a synchronization signal N for each frame. It sends out a frame-by-frame control signal to the next stage 22 (DRI), and outputs the waveform shown in FIG. 3 (5-R) excluding the synchronization code N to 22 (DRI).

22 (DRI) is a received code processing unit 1, which outputs a digital code (5-R) of the received information that has been restored in accordance with the timing and output impedance with an external interface device (for example, a printer, etc.).

As explained in detail above, the receiving station can restore the digital code of the original information in accordance with the random number synchronization code transmitted from the transmitting station.

In addition, in FIG. 7, mobile station CI is connected to other mobile stations AI, B1, B2.
, B3 and perform mutual transmission and reception, it is possible to synchronize with other mobile stations using the same clock or timer in the same manner as the random number synchronization setting described above. As described above, by implementing the present invention, it is possible to easily form a communication network that performs random number synchronization among multiple mobile stations existing in a wide area, but it is also highly confidential and effective even on wireless lines with poor transmission quality. The ability to transmit codes of digital random numbers is a significant practical advantage. In the above explanation, random number synchronization codes are used as random number methods A and B.
We have shown an example of using two types and applying this twice,
Even if three or more random number synchronization codes are applied to increase the degree of confidentiality, random number synchronization can be easily performed using a clock or a timer in the same way to establish mutual transmission and reception of random number digital code transmission between a plurality of mobile stations.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the circuit configuration of a wireless line transmitting and receiving device embodying the present invention, FIGS. 2 and 3 are waveform diagrams of each part of the transmitting device and receiving device shown in FIG. 1, respectively, and FIG. A pattern diagram of random number synchronization codes A and B, FIG. 5 is an example of the panel surface of the random number control unit 1 in FIG. 1, FIG. 6 is an explanatory diagram of changes in random number synchronization codes, and FIG. FIG. 2 is an example diagram of an intercommunication system. 1... Transmission code processing section (DTI), 2... Synchronization code addition section 1 (STI), 3-6... Random number multiplication circuit (CP
TI~CPT4}, 7... Modulation section, 8... Transmission section,
9... Random number control unit 1 (CONTI), 10 to 13, 2
3 to 26...Control signal, 14...Timer control section (TMI)
, 15... Receiving section, 16... Demodulating section, 17... Random number synchronization detection section 1 (CPSYNCI), 18-20...
Random number translation units 1, 2, 3 (CPR1, 2, 3), 21...
- Reception synchronization unit 1 (SRI), 22... Reception code processing unit 1 (DRI). Diagram Ice 2 Diagram Light 3 Diagram Rare 5 Diagram Juice 7 Diagram Ne 4 vs. 6

Claims (1)

[Claims] 1. When multiple communication stations transmit digital codes to each other by multiplying the digital code of the original information by random numbers for secrecy,
A nonstop clock or timer is started operating at a specified time between each communication station, and the random number synchronized digital code B is controlled by these and changed at short intervals as time passes, and the random number synchronized digital code B is changed at long intervals. A random number synchronous digital code A is used to multiply the original information digital code by a random number every frame by the random number synchronous digital code B, and then a random number is multiplied every several frames by the random number synchronous digital code A. The random number synchronous digital code B and the original information digital code are both changed and transmitted by multiplying by After obtaining random number synchronization by detecting a preset code pattern,
A communication method using digital random numbers, characterized in that a random number synchronization signal is removed and an original information digital code is restored using a preset random number translation signal.