JPH04360438A - Data transmission method - Google Patents

Abstract

PURPOSE:To obtain the data transmission method in which decoding is difficult when a personal data or a data with high confidentiality is sent. CONSTITUTION:Data generated by a pseudo random data generating section 1 based on a password and a service ID or the like in a data to be sent are subject to addition processing in an exclusive OR circuit 14, coded in an error correction coder 3 and data arrangement is rearranged in an interleave section 4. A formatter 5 adds a synchronizing signal and information such as address information, the result is outputted according to a transmission signal format, modulated by a modulation section 6, the personal ID and the password are collated at line connection and the result is sent to a destination designated by an address. The address includes personal ID information and the relevant password and service ID are managed by a personal identification information management section 2 and used for generating a pseudo random data at a receiver side.

Description

[Detailed description of the invention]

0001

[Industrial field of application] This relates to the transmission of personal data and highly confidential data.

0002

2. Description of the Related Art FIG. 4 is a transmission signal format diagram showing an example of a signal used in digital packet communication, and FIG. 5 is a block diagram showing an example of a conventional data transmission method. generation section; 3 is an error correction encoder; 4 is an interleave section; 5 is a formatter; 6 is a modulation section; 7 is a demodulation section; 8 is a deformatter; 9
10 is a deinterleaving unit, 10 is an error correction decoder, and FIG. 6 is a circuit configuration diagram showing an example of a conventional pseudo-random data generation unit. In the figure, 13 is a shift register, 14 is an exclusive OR circuit, and 15 is a data Input terminal, 16 is a bit shift clock input terminal, 17 is a data load signal input terminal, 18 is a switch, 19 is a key data input section, 20
is a data conversion ROM, FIG. 7 is a circuit configuration diagram showing another example of a conventional pseudo-random data generation section, FIG. 8 is a transmission signal format diagram showing an example of a signal used in a conventional data transmission method, and FIG. 1 is a transmission signal format diagram showing another example of a signal used in a conventional data transmission method.

Next, the diagram will be explained. First of all, data communication using public telephone lines or dedicated data lines is kept confidential by verifying the input of personal ID and password when connecting to the line, and connecting only if the data matches the data, as shown in Figure 4. CCITT Recommendation X. Although the data is sent to the destination specified by the address in a transmission signal format compliant with 25, the data itself is transmitted in a format that can be used by other subscribed users.

Next, an example in which the data itself is protected in some way will be explained. On the transmitting side, the exclusive OR circuit 14 adds the data generated by the pseudo-random data generator 1 to the transmitted data, and then generates pseudo-random data, which is important for data restoration on the receiving side. The error correction encoder 3 performs encoding together with the key data used in the data processing, and the interleaving unit 4 rearranges the data arrangement. A formatter 5 adds a header such as a synchronization signal, an identification signal, and address information, as well as information necessary for data restoration on the receiving side, outputs the data according to the transmission signal format, and modulates it in a modulator 6. and sent out.

On the receiving side, the transmitted data is sent to a demodulator 7.
After demodulating, a deformatter 8 removes the header and information necessary for data restoration, and a deinterleaving unit 9 returns the data to the original data arrangement. The error correction decoder 10 performs error correction on this data, and based on the highly reliable key data used to generate the pseudo-random data, the data generated by the pseudo-random data generator 1 is XORed. By performing addition processing in the circuit 14, the original data is restored.

The internal circuit configuration of the pseudo-random data generating section 1 is as shown in FIGS. 6 and 7, and n-bit key data input to the key data input section 19 is input to the data load signal input terminal. The signal is loaded into the shift register 13 at the timing of the signal input to the bit shift clock input terminal 17, and shifted using the clock input to the bit shift clock input terminal 16. (n: natural number) Addition processing is performed in the exclusive OR circuit 14 between predetermined bits of this shift register and input sequentially, and arbitrary i-bit information is converted in the data exchange ROM 20 as shown in FIG. The output information, or specific bit information as shown in FIG. 7, and the serial input of the data to be transmitted inputted to the data input terminal 15 are added bit by bit in the exclusive OR circuit 14. (i: natural number) The added data and the unadded data are output while being switched by a switch 18 depending on the data content.

According to the 1988 Telecommunications Technology Council report on the technical conditions for paid systems in television broadcasting by broadcasting satellites, the key data used to generate pseudo-random data is a transmission signal as shown in FIG. In the format, the program information in the unique data is included, and the data load signal for updating the program information is included in the control code. Furthermore, in digital audio recording of a VHS video tape recorder, data in the address information portion that is not scrambled is used in the transmission signal format as shown in FIG. 9, and the update is performed in units of data blocks.

[0008]

[Problem to be solved by the invention] The conventional data transmission method is configured as described above, and even if a password is set, once the check is completed at the time of data line connection, it can be used for security protection during data transmission. Furthermore, even when data is scrambled for security purposes during data transmission, the pseudo-random data used to scramble it itself periodically changes into different patterns; however, pseudo-random data Since all generation control information is included in the transmitted data, other subscribed users can easily descramble it as long as they have equipment compatible with the transmitted signal format, which eliminates the problem of high possibility of eavesdropping. there were.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a data transmission method that is difficult to decipher when transmitting personal data or highly confidential data. shall be.

0010

[Means for Solving the Problems] In the data transmission method according to the present invention, data is transmitted together with an identification signal given to each individual, household, or corporation, and the data portion is This is scrambled pseudo-random data generated based on PIN numbers that individuals, households, or corporations have registered with each other or with the center system, and is then scrambled and sent to the receiving end. be. Further, it is configured to be updated periodically based on a control signal included in the transmission data or every fixed data length.

[0011] Furthermore, data is transmitted together with an identification signal assigned to each individual, household, or corporation. or the code number applied and registered in the sensor system and an identification signal indicating the content of multiple types of information provision or convenience provided to the individual, household, or corporation mutually or authorized and registered in the center system. The system scrambles the pseudo-random data generated based on the received data and sends the scrambled data, which is then descrambled at the receiving end. Further, it is configured to be updated periodically based on a control signal included in the transmission data or every fixed data length.

0012

[Operation] Since the data transmission method of the present invention scrambles using pseudo-random data generated based on individual signals that are not included in the transmitted data, it is impossible to descramble unless the individual signal information is known. It is difficult.

[0013]

【Example】

Example 1. FIG. 1 is a block diagram showing an embodiment of the data transmission method of the present invention, in which 1 is a pseudo-random data generation section, 2 is a personal identification information management section, 3 is an error correction encoder, 4 is an interleave section, 5 is a formatter, 6 is a modulation section, 7 is a demodulation section, 8 is a deformatter, 9 is a deinterleaving section, 10 is an error correction decoder, and FIG. 2 is a circuit showing an embodiment of the pseudorandom data generation section of the present invention. 11 is a password input section, 12 is a service ID input section, 13 is a shift register, 14 is an exclusive OR circuit, 15 is a data input terminal, 16 is a bit shift clock input terminal, and 17 is a data block diagram. A load signal input terminal, 18 a switch, 19 a key data input section, 20 a data conversion ROM, FIG. 3 is a circuit configuration diagram showing another embodiment of the pseudorandom data generation section of the present invention, and FIG. 4 is a digital packet communication FIG. 2 is a transmission signal format diagram showing an example of a signal used in the transmission.

Next, the drawings will be explained. On the transmitting side, the exclusive OR circuit 14 adds the data generated by the pseudo-random data generator 1 based on the password, service ID, key data, etc. to the data to be transmitted, and then the data is added to the data to be transmitted. The error correction encoder 3 performs encoding together with the key data used for pseudorandom data generation, which is important in data restoration, and the interleave unit 4 rearranges the data arrangement. For this data, formatter 5
headers such as synchronization signals, identification signals, and address information, as well as information other than passwords and service IDs that are necessary for data restoration on the receiving side, are output in accordance with the transmission signal format, and then modulated by the modulator 6. Modulated and sent out.

[0015] In data communication using public telephone lines or dedicated data lines, the personal ID and password are entered and verified when connecting to the line, and the connection is made only if the data matches, ensuring confidentiality.The data is shown in Figure 4. The signal is transmitted to the destination specified by the address in a transmission signal format such as . This address contains personal ID information.
The password and service ID that correspond to this personal ID are
It is managed by the personal identification information management section 2.

On the receiving side, the transmitted data is sent to a demodulator 7.
After demodulating, a deformatter 8 removes the header and information necessary for data restoration, and a deinterleaving unit 9 returns the data to the original data arrangement. Error correction is performed on this data by the error correction decoder 10, and the key data used to generate highly reliable pseudo-random data and the password and service I output from the personal identification information management section 2 are collected.
Based on D, the data generated by the pseudo-random data generator 1 is subjected to addition processing by the exclusive OR circuit 14, thereby restoring the original data.

The internal circuit configuration of the pseudo-random data generation unit 1 is as shown in FIGS. 6 and 7, and the 1-bit password input to the password input unit 11 and the service The inputted m-bit service ID and the n-bit key data inputted to the key data input section 19 are respectively loaded into the shift register 13 at the signal timing inputted to the data load signal input terminal 17, and the bit shift clock input is performed. Shift is performed using the clock input to terminal 16. (1, m: natural number) Addition processing is performed in the exclusive OR circuit 14 between predetermined bits of this shift register and inputted sequentially, and arbitrary i-bit information is converted in the data conversion ROM 20 as shown in FIG. , the serially outputted information, or specific bit information as shown in FIG. 7, and the serial input of the data to be transmitted inputted to the data input terminal 15 are added bit by bit in the exclusive OR circuit 14. . The added data and the unadded data are output while being switched by a switch 18 depending on the data content.

The key data used to generate pseudo-random data is included in the transmission signal format, and the key data is updated every fixed data length, or the data load signal for updating is also included in the transmission signal format. include. The initial values of the password and service ID at the time of contract are provided by other information transmission means, but subsequent changes to the password and service ID and transmission of updated information are all possible within this data transmission method. , after the data transmission line to which the change or update information was transmitted is disconnected, it will be applied from the next line connection.

Example 2. In the above embodiment, the data is subjected to error correction encoding and decoding, interleaving and deinterleaving, modulation and demodulation, but any of these processes may or may not be performed, and the order thereof does not matter. The processing method may also be arbitrary.

Example 3. Also, although pseudorandom data is added before error correction encoding and after decoding, this is not particularly limited and may be after encoding or before decoding, or after interleaving or deinterleaving. It can be placed before the formatter, after the formatter, or before the deformatter.

Example 4. Furthermore, the number of bits for passwords, service IDs, key data, etc. may be arbitrary and may or may not be updated periodically, but if they are updated periodically, the number of bits may be greater than the number of data transmitted within the update period. 2(1+m+
It is desirable to select 1, m, and n so that n) is large. Furthermore, the bit-to-bit addition position of the shift register and the extraction bit position for addition with data may be arbitrary.

Example 5. Furthermore, the transmission signal format may be arbitrary as long as it includes address information that allows identification of the transmission destination, and an identification signal of the same type other than the personal ID may be used instead.

Example 6. Furthermore, it is desirable to include address information such as a personal ID, key data used for pseudo-random data generation, and information important when restoring data on the receiving side in the error correction code.
Does not need to be included.

[0024]

[Effects of the Invention] The data transmission method of the present invention scrambles pseudo-random data generated based on individual signals that are not included in the transmitted data, so unless the individual signal information is known, the data will be descrambled. It is difficult to do so. Therefore, even if the transmitted data is overheard by a device compatible with the transmitted signal format, there is an effect that other subscribed users cannot descramble the data.

[0025] Furthermore, by including address information such as a personal ID, key data used to generate pseudo-random data, or information important when restoring data on the receiving side in the error correction code, the data can be corrected. This has the effect of increasing reliability and recovery probability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the data transmission method of the present invention.

FIG. 2 is a circuit configuration diagram showing an embodiment of a pseudorandom data generation section of the present invention.

FIG. 3 is a circuit configuration diagram showing another embodiment of the pseudorandom data generation section of the present invention.

FIG. 4 is a transmission signal format diagram showing an example of a signal used in digital packet communication.

FIG. 5 is a block diagram showing an example of a conventional data transmission method.

FIG. 6 is a circuit configuration diagram showing an example of a conventional pseudo-random data generation section.

FIG. 7 is a circuit configuration diagram showing another example of a conventional pseudo-random data generation section.

FIG. 8 is a transmission signal format diagram showing an example of a signal used in a conventional data transmission method.

FIG. 9 is a transmission signal format diagram showing another example of a signal used in a conventional data transmission method.

[Explanation of symbols]

1 Pseudo-random data generation section 2 Personal identification information management section 3 Error correction encoder 5 Formatter 8 Deformatter 10 Error correction decoder 11 Password input section 12 Service ID input section 13 Shift register 14 Exclusive OR circuit 15 Data input terminal 16 Bit shift clock input terminal 17 Data load signal input terminal 20 Data conversion ROM

Claims (4)

[Claims] Claim 1: When performing two-way data transmission, data is transmitted together with an identification signal assigned to each individual, household, or corporation, and the data portion is not included in the transmitted data. A data transmission method characterized in that the individuals, households, or corporations send the scrambled data using pseudo-random data generated based on the password numbers applied and registered to each other or to a center system, and the data is descrambled on the receiving side. 2. The data transmission method according to claim 1, wherein the pseudo-random data is updated periodically based on a control signal included in the transmission data or every fixed data length. [Claim 3] When performing two-way data transmission, data is transmitted together with an identification signal (hereinafter referred to as an individual ID) assigned to each individual, household, or corporation, and the data portion is The password number (hereinafter referred to as a password) that is not included in the transmitted data and has been applied and registered by the individual, household, or corporation to each other or to the sensor system, and to the individual, household, or corporation, Alternatively, the reception side scrambles and transmits pseudo-random data generated based on identification signals (hereinafter referred to as service IDs) indicating the content of multiple types of information provision and convenience provision that are authorized and registered in the center system. A data transmission method characterized by releasing the data. 4. The data transmission method according to claim 3, wherein the pseudorandom data is updated periodically based on a control signal included in the transmission data or every fixed data length.