RU2631981C2 - Method of block encryption with private key - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: method of block encryption with a private key, including partitioning messages into the transmitter on a separate set of k-bit data blocks in the number (N≥2), carrying out initialization of the private key before sending the message (when i=0) in the transmitter and the receiver with the same value of the private key, forming subkey sequences from the private key, followed by their decryption in the transmitter of the corresponding transmitted data blocks, block-by-block transmitting the data generated in the communication channel and the subsequent decryption of the transmitted data blocks at the receiver through the mentioned sunkey, including various modifications, at first the service information block that contains the modifier of the (i+1)-th closed subkey is attached to the (i)-th data block in the transmitter, and then the data block and service information are encrypted with the (i)-th subkey of the plurality of the sunkeys, and then the control bits are formed and added to the i-th transmitted block, then the (i)-th block with the control bits is sent to the receiver, where the correctness of the (i)-th received block is controlled by the control bits, then the (i)-th received block is encrypted with the (i)-th closed subkey and separated into the i-th data block and (i)-th service information block, the value of the next (i+1)-th closed subkey is formed with the possibility of decrypting the next (i+1)-th block by it in the receiver of the (i)-th subkey and the (i+1)-th modifier; moreover, after transmitting, receiving and controlling the correctness of each of the i-th transmitted block in the transmitter and the receiver, synchronously a new value of the closed subkey is set from the plurality of subkeys of the private encryption key, then the transmission of the next (i+1)-th data block is resumed with the (i+2)-th modifier private subkey in the transmitter, and the received message is formed in the receiver from the correctly received data blocks. The data blocks are mixed with the blocks containing random numbers in the transmitter, then, after encryption, the blocks are transmitted at different frequencies, wherein a block number is transmitted in the service information block, which indicates that the block contains random numbers, as well as the code specifying the transmission frequency for the next block, and the blocks are received at different frequencies in the receiver, after the decryption, the blocks containing random numbers are separated from the blocks containing the data, then the data blocks are ordered by numbers, and a message is formed from them, the receiver generates a receipt on each correctly received data block and transmits it by radio to the transmitter.

EFFECT: increased crypticity.

3 cl, 3 dwg

Description

The invention relates to computing, to methods of cryptographic protection of data transmitted over the air.

Encryption and decryption is performed in order to protect data from unauthorized access by third parties.

Encryption methods are divided into symmetric and asymmetric. The symmetric method uses one private secret key to encrypt and decrypt messages. The asymmetric method uses two keys: a public public key for encryption and a private secret key for decrypting messages.

The claimed invention relates to encryption methods with a private key.

The technical result of the claimed invention is to increase the cryptographic strength of the block encryption method.

Cryptographic strength is the ability to withstand hacking encrypted messages by third parties. Cryptographic strength is measured by the number of elementary operations that must be performed to restore the original information message with knowledge of the conversion method, but without knowledge of the key. The encryption conversion method is generally known. The key is calculated by brute force, using hardware and software. Key matching is called key hacking. Cryptographic strength depends on the encryption method and the length of the key used.

To increase the cryptographic strength, block data encryption is used when they split the message into separate blocks, and the key is divided into subkeys, then these blocks are encrypted, and each block uses its own subkey to encrypt.

The methods of block encryption with a private key include GOST 28147-89 (Russia), DES (Data Encryption Standard, USA), etc.

The GOST 28147-89 cryptographic conversion algorithm uses a block cipher with a 256-bit key and 32 conversion cycles, operating with 64-bit blocks. For encryption, the plaintext is first split into two halves (the low-order bits are A, the high-order bits are B). On the i-th cycle, the Ki subkey is used. To generate subkeys, the original 256-bit key is divided into eight 32-bit blocks: K1 ... K8. Ai and Ki add up modulo 2 ³² . The result is divided into eight 4-bit subsequences (tetrads), each of which is fed to the input of its node in the substitution table, called the S-block. The table defines the substitution when one tetrad is replaced by another tetrad. The outputs of all eight S-blocks are combined into a 32-bit word, then the whole word is cyclically shifted to the left (to the upper digits) by 11 bits. (USSR standard GOST 28147-89. Information processing systems. Cryptographic protection. Cryptographic conversion algorithm, Moscow, USSR Civil Code according to 1989 standards). GOST-28147-89 does not describe the process of generating keys and replacement tables. There are “weak” keys and substitution tables, but the standard does not describe criteria for selecting and dropping out “weak” ones. The disadvantage of this algorithm is the use of a permanent 256-bit key from which subkeys are formed. In software implementation, this encryption method does not provide high speed (more than 1 Mbps) due to the need to convert data formats. Modern processors operate on data that is a multiple of 1 byte (8, 16, 32, 64, 128 bits). This method uses a large number of substitution operations on 4-bit data blocks (up to 32 rounds). During each round, the processor converts the data formats. First, 4-bit tetrads (8 bits → 4 + 4 bits) are allocated in a byte, and then table substitution and inverse conversion is performed (8 × 4 bits → 32 bits). Converting data formats reduces encryption speed.

In the US DES standard, data block encryption is performed by generating a key, dividing the converted data block into two subblocks L and R, and changing the latter one by one by bit by bit summing modulo two over the subblock L and the binary vector, which is formed as the output value of some function F from the values of the sub-block R. After that, the blocks are rearranged. Function F in the indicated method is implemented by performing permutation and substitution operations performed on sub-block R (National Bureau of Standards. Data Encryption Standard. Federal Information Processing Standards Publication 46, January 1977). In DES, each data block is encrypted independently of the others. This allows you to decrypt individual blocks of encrypted messages or data structures, and therefore, opens up the possibility of independent transmission of data blocks or random access to encrypted data. DES uses a small key, which makes it vulnerable to cryptanalysis based on key selection. In DES, the encryption key is represented as a collection of subkeys. For all i-input data blocks, the same i-th subkey will be used, which reduces the level of cryptographic protection.

A known method of block encryption of binary information, which includes generating an encryption key in the form of a set of subkeys, dividing a data block into N≥2 subblocks and alternately converting the subblocks by performing an encryption operation on the subblock and subkey. Before performing a two-place encryption operation on the i-th subunit and subkey, the substitution operation on the subkey is performed, depending on the j-th subunit, where j ≠ i. As a substitution operation performed on a subkey depending on the jth subunit, a control operation or a substitution operation depending on the encryption key is used (M. Eremeev, A. Moldovyan, N. Moldovyan. Method of cryptographic conversion of digital data blocks , Patent No. 2211541, RU, priority 08/08/2001; Moldovyan A.A., Moldovyan N.A., Savlukov N.V. Method for block encryption of binary information, Patent No. 2140712 RU, priority 08.11.2001, Moldovyan A.A. et al. Method for encrypting information represented by binary code Patent No. 2103829, priority 02.04. 1997).

A disadvantage of the analogues of the claimed method is the use of one source private key, from which using substitutions, permutations, transformations, functions, etc. get a sequence of subkeys for subunits. Knowing the conversion rule, you can pick up the key.

The secret key can not only be picked up, but it can also be stolen or lost as a result of a failure of a computer or information storage device.

Closest to the claimed (prototype) is a method of block encryption of messages and transmission of encrypted data with a private key, including dividing the message in the transmitter into a set of individual k-bit data subunits in the amount of (N≥2), initializing the private key before transmitting the message (when i = 0) in the transmitter and receiver with the same value of the private key, the formation of the sequence of subkeys from the private key, followed by their encryption in the transmitter of the corresponding transmitted blocks data, block-by-block transmission of generated data over the communication channel and subsequent decryption of the transmitted data blocks in the receiver by means of the aforementioned subkeys, including various modifications, characterized in that the transmitter generates the (i) th transmitted data block from the i-th data subunit and connected to it the (i) th subunit of service information in the form of the (i + 1) th modifier of the closed subkey, and encrypt it with the (i) th corresponding subkey from the set of subkeys; form control bits in the transmitter and attach them to the i-th transmitted data block; after that, the (i) th data block with the control bits is transmitted to the receiver and check the correctness of the received (i) th data block using the control bits, after which the received (i) th data block is decrypted with the (i) th closed subkey and shared it to the i-th sub-block of data and (i) -th sub-block of service information; in the receiver, a receipt is generated for each correctly received data block and transmitted through the communication channel to the transmitter, and from the (i) th subkey and (i + 1) th sub modifier, the value of the next (i + 1) th closed subkey is formed, with the ability to decrypt the next (i + 1) -th data block; after transmitting and checking the correct reception of each i-th transmitted data block, the transmitter and receiver synchronously set the new value of the closed subkey from the set of private encryption key subkeys, after which the transmitter resumes the transmission of the next (i + 1) -th data block from (i + 2) th modifier of the closed subkey; moreover, from the correctly received subblocks of data, the received message is formed (I.S. Kabak, N.V. Sukhanova, B.M. Pozdneev. Method for block encryption of messages and transmission of encrypted data with a private key. Patent for invention No. 24593367, priority 16.07.2010) .

Analogs and prototype of the claimed method has the following disadvantages:

To generate block subkeys, one source private key and one random number generator are used. The first sub-block is encrypted with a private key. Then, using a private key and a random number generator, a sequence of subkeys is formed for the i-th subunits (i≥2).

Theft or selection of the private key allows you to determine the value of the subkey for the first sub-block. The remaining subkeys are obtained by decrypting consecutive subunits of overhead information.

The purpose of the invention is to increase the cryptographic strength when transmitting data over the air.

Cryptographic stability is enhanced by the following transformations, which prevent the accumulation of successive message blocks by third parties, with the aim of cryptanalysis:

1. mixing message blocks with blocks of the same size containing random numbers;

2. the choice of different frequencies for transmitting blocks;

3. The choice of frequency for the transmission of each block based on a random number generator.

The essence of the invention is as follows. The claimed method uses a private key. The private key consists of a finite sequence of subkeys.

At the beginning of the transmission of the message, the transmitter and receiver initialize the private key, i.e. enter the initial value of the subkey (at i = 0) for encryption-decryption of the first block. This subkey is the same for the receiver and transmitter. Then the message is divided into separate data blocks. Blocks of data are mixed with blocks containing random numbers.

In the transmitter, service information for the next (i + 1) th block is attached to the i-th block, which includes the block number, the key modifier, a code sign indicating that the block contains random numbers, and also a code that sets the frequency of transmission over the air. Then the i-th block and service information are encrypted with the i-th subkey and in encrypted form are transmitted over the air at the selected frequency.

Thus, blocks containing data or random numbers are encrypted using a private key.

Each block is encrypted with its unique subkey.

The first subblock of data is encrypted with the entered private subkey. Then, for each (i + 1) th block, a new (i + 1) th subkey is formed, which functionally depends on the previous i-th subkey and the (i + 1) th key modifier. The key modifier is a random number. The key modifier is generated in the transmitter using a random number generator.

The receiver receives and decrypts the ith block using the ith subkey. After decryption, the ith block is divided into the ith block of data and service information for the next (i + 1) th block, which includes the block number, the key modifier, a code sign indicating that the block contains random numbers, as well as a code, setting the frequency of transmission over the air. Then the receiver generates a new subkey value for the (i + 1) -th data block, using the i-th subkey and the key modifier for the (i + 1) -th data block. Thus, after the transmission and reception of the next block of data, the private key synchronously changes at the transmitter and receiver of data.

The receiver skips blocks containing random numbers without processing. The receiver decrypts the blocks containing data using a subkey and connects it to the message in the order of their numbers.

The claimed method provides equivalent variable keys at the transmitter and receiver of data. When receiving and transmitting data, the private key is constantly changing, and randomly. Only individual fragments of the private key are transmitted over the air in encrypted form. At the same time, the private key remains secret and inaccessible to third parties. Blocks of data are mixed with blocks of random numbers. An attempt to decrypt a block containing random numbers gives a meaningless set of characters and makes cryptanalysis difficult.

Typically, messages are transmitted on the same frequency. Changing the frequency leads to the loss of information that is transmitted at other frequencies. When receiving information on one frequency, third parties can receive only part of the total sequence of encrypted data blocks that are mixed with blocks of random numbers.

For cryptanalysis, it is required to know all the frequencies at which transmission is possible, and to continuously record all information at these frequencies.

Thus, the claimed method of block encryption of data with a private key makes cryptanalysis difficult and provides a high level of cryptographic strength.

In the claimed method, a significant difference from analogues and prototypes is the transfer of additional service information, as a part of each transmitted block, including:

- a code sign that indicates that this block contains random numbers;

- block number;

- transmission frequency for the next block.

Service information is transmitted in encrypted form. Moreover, the key length exceeds the volume of the entire block of information.

The claimed method of block encryption with a private key is illustrated by graphic materials, see Fig. 1-3.

In FIG. 1 shows an example of information transfer, where 1 is a message, 2 is a data block, 3 is a random number block, 4 is service information, 5 is a random number generator, 6 is a private key, 7 is an encryptor, 8 is an encrypted data block, 9 is control device, 10 — control bits, 11 — radio signal transmitter with a choice of frequency f _i .

In FIG. 2 shows a method of block encryption with a private key, where the transmission of blocks 8 with control bits 10 occurs simultaneously at several frequencies f _i during time intervals f _i .

In FIG. Figure 3 shows an example of receiving information, where 1 is a message, 2 is data blocks, 3 is a random number block, 4 is service information, 6 is a private key, 7 is a decoder, 8 is an encrypted data block, 9 is a control device, 10 is a control bits, 11 - receiver of radio signals with the ability to tune to frequencies f _i , 12 - receipt.

An example of using the claimed method of block encryption with a private key is shown in FIG. 1-3.

Before transmitting the message (with i = 0), the transmitter and receiver initialize the private key. Then, during the transmission of each data block, the value of the private key in the transmitter and receiver is synchronously changed. The transmitter and receiver are implemented according to symmetrical schemes (see. Fig. 1, 3). In the transmitter, message 1 is divided into separate data blocks 2. Data blocks 2 are mixed with blocks containing random numbers 3. Then, the i-th block of service information 4 is attached to each i-th block, where the (i + 1) -th key modifier is written . Each block is encrypted with its private subkey 6. The subkey for the (i + 1) -th block functionally depends on the sub-connection of the previous i-th block 6 and the (i + 1) -th key modifier 4, which is generated at the output of the random number generator 5. Blocks data and blocks of service information attached to them are fed to the inputs of the encoder 7, the output of which is encrypted blocks 8. The output of the encoder 7 is connected to the input of the control device 9, in which the control bits 10 are formed and are connected to the i-th block. Then, the frequency f _{i is} selected and encrypted blocks 8 with control bits 10 are transmitted at this frequency, see FIG. 2. At the receiver (see Fig. 3), the reception frequency is selected, blocks are received via the radio channel, which are then fed to the input of the control device 9, where a receipt 12 is generated for the blocks received with distortions. A decoder 7 is connected to the output of the control device 9, and for decrypting the (i + 1) -th block, use the (i + 1) -th closed subkey 6, which functionally depends on the i-th closed subkey and (i + 1) -th modifier the key.

The claimed method of block encryption of messages and transmission of encrypted data with a private key is as follows, see FIG. 1, 2, 3.

1. At the beginning, before transmitting the message (at i = 0), the secret private keys are initialized in the transmitter and receiver. During initialization, enter the private key 6. This key is the same for the transmitter and receiver.

2. At the transmitter, the message is divided into a set of individual k-bit data blocks 2. The number of data blocks N≥2. The size of data block 2 should be less than the length of the closed subkey, which is used to encrypt it.

3. Using a random number generator 5 form k-bit blocks of random numbers 3. After that, the data blocks are mixed with blocks of random numbers. Then all the blocks are numbered.

4. For each i-th block, overhead information is generated. Using the random number generator 5 form the modifier of the private key. The (I + 1) th private key modifier is entered into the i-th block of service information 4. A code flag is also entered into the block of service information, which indicates that this block contains random numbers; number of the next block; transmission frequency for the next block. Service information is attached to the i-th block.

5. The i-th block of data is encrypted using the i-th closed subkey.

6. Over the i-th private subkey and i-th private key modifier, a functional conversion is performed and a new value of the (i + 1) -th private subkey is obtained. In the transmitter, control bits are formed for each data block, which are connected to this data block. For example, these may be parity bits or block checksum bits.

7. The encrypted i-th data block is transmitted over the air at a frequency f _i during the time interval f _i , see FIG. 2. Repeat steps 3-6 to encrypt all data blocks in the message.

8. The i-th data block is received in the receiver and the correctness of its reception is checked in the control device 9. For example, when checking it is possible to determine the parity bits or the checksum bits of the block and compare them with the corresponding control bits received in the data block.

9. For each block received with distortion, the control device 8 generates and transmits a receipt 12. The receipt contains the number of the incorrectly received block. The receipt goes to the transmitter.

10. Then the receiver using the decoder 7 decrypts the i-th data block using the i-th subkey. The result is the decrypted i-th data block. In the random number block 3, only the service information is used 4. The data block is divided into two sub-blocks — the i-th sub-block of data 2 and the i-th sub-block of service information 4. Data sub-block 2 is attached to message 1.

11. In the i-th sub-block of service information 4, the private key modifier is allocated for the next (i + 1) -th block.

12. Form a new closed (1 + 1) -th subkey 6 in the receiver. The new private subkey for the (i + 1) -th block is functionally dependent on the i-th private subkey and the private key modifier for the (i + 1) -th block (which was obtained in step 11).

13. Repeat steps 8-12 to receive and decrypt all data blocks 2 in message 1.

The claimed method of block encryption with a private key provides reliable data delivery, guarantees the identity of the sent and received data blocks, their integrity and the fact that the data blocks are received in the same order as they were sent.

Reliable data delivery implies that four conditions of unreliable delivery are excluded, namely, the blocks cannot be lost or damaged, delayed, doubled (tripled), delivered in the wrong order as they were sent. Reliable delivery ensures that the message (as a sequence of blocks) will be delivered to the receiver in the same form in which it was sent by the transmitter. In the event that messages are lost, damaged, delayed, delivered in the wrong order in the receiver, then a receipt 12 is generated in the control unit 9. After a specified timeout, the transmitter resends the blocks, starting from the first block to which the receipt was received.

In the event of a transmission failure, the transmitter and receiver may have different private keys. In this case, the control unit generates a receipt, which indicates from which block the message should be repeated.

The proposed method of block encryption with a private key is suitable for any encryption and decryption methods and for any amount of information.

The technical result of the invention is to increase the level of cryptographic security and message rate.

The technical result of the invention is achieved due to the fact that with the claimed method of block encryption with a private key, which includes splitting the message in the transmitter into a set of individual k-bit data blocks in an amount (N≥2), initializing the private key before transmitting the message (at i = 0) in the transmitter and receiver with the same value of the private key, the formation of a sequence of subkeys from the private key, followed by their encryption in the transmitter of the corresponding transmitted data blocks, block the transmission of the generated data over the communication channel and the subsequent decryption of the transmitted data blocks in the receiver by means of the above-mentioned subkeys, including various modifications, first of all, in the transmitter, the service information block containing the (i + 1) -th modifier is connected to the (i) -th data block closed subkey, then the data block and service information is encrypted with the (i) -th subkey from the set of subkeys; after which control bits are formed and connected to the i-th transmitted block, then the (i) th block with control bits is transferred to the receiver, where the control bits are checked for the correctness of the received (i) -th block, after which the received (i) - the block is decrypted with the (i) -th closed subkey and divide it into the i-th data block and (i) -th block of service information, in the receiver from the (i) -th subkey and (i + 1) -th modifier form the value of the following (i + 1) -th closed subkey with the ability to decrypt the next (i + 1) -th block; moreover, after transmitting, receiving and verifying the correctness of each i-th transmitted block in the transmitter and receiver, the new value of the closed subkey is synchronously set from the set of private encryption key connections, after which the transmitter resumes the transmission of the next (i + 1) -th data block from (i The +2) th modifier of the closed subkey, and the received message is formed from correctly received data blocks in the receiver, according to the invention, the data blocks in the transmitter are mixed with blocks containing random numbers, then the last e encryption blocks are transmitted at different frequencies, and in the block of service information transmit the block number, a code sign that indicates that this block contains random numbers, as well as a code that sets the transmission frequency for the next block, and the receiver receives blocks at different frequencies, after decryption, the blocks containing random numbers are separated from the blocks containing data, then the data blocks are ordered by numbers, and a message is formed from them, the receiver forms a receipt for each incorrectly received data block and transmits it over the air to the transmitter.

The technical result is achieved due to the fact that with the claimed method of block encryption with a private key, according to the invention, the frequency ranges for transmitting and receiving blocks are set by a random number sensor.

The technical result is achieved due to the fact that with the claimed method of block encryption with a private key, according to the invention, a code sign that indicates that this block contains random numbers is generated by a random number sensor.

1. A method of block encryption with a private key, including dividing the message in the transmitter into a set of individual k-bit data blocks in an amount (N≥2), initializing the private key before transmitting the message (at i = 0) in the transmitter and receiver with the same private value key, generating a sequence of subkeys from the private key, followed by their encryption in the transmitter of the respective transmitted data blocks, block-by-block transmission of the generated data over the communication channel, and subsequent decryption of the transmitted data blocks in the receiver by means of the mentioned plug-ins, including various modifications, first, in the transmitter, the service information block containing the modifier of the (i + 1) -th closed subkey is connected to the (i) -th data block, then the data block and service Information (i) by the subkey from the set of subkeys; after which control bits are formed and connected to the i-th transmitted block, then the (i) th block with control bits is transferred to the receiver, where the control bits are checked for the correctness of the received (i) -th block, after which the received (i) - the block is decrypted with the (i) -th closed subkey and divide it into the i-th data block and (i) -th block of service information, in the receiver from the (i) -th subkey and (i + 1) -th modifier form the value of the following (i + 1) -th closed subkey with the ability to decrypt the next (i + 1) -th block; moreover, after transmitting, receiving and verifying the correctness of each i-th transmitted block in the transmitter and receiver, the new value of the closed subkey is synchronously set from the set of private encryption key connections, after which the transmitter resumes the transmission of the next (i + 1) -th data block from (i +2) th modifier of the closed subkey, and in the receiver, from the correctly received data blocks, a received message is generated, characterized in that the transmitter blocks the data blocks with blocks containing random numbers, then the last e encryption blocks are transmitted at different frequencies, and in the block of service information transmit the block number, a code sign that indicates that this block contains random numbers, as well as a code that sets the transmission frequency for the next block, and the receiver receives blocks at different frequencies, after decryption, the blocks containing random numbers are separated from the blocks containing data, then the data blocks are ordered by numbers, and a message is formed from them, the receiver forms a receipt for each incorrectly received data block and transmits it over the air to the transmitter.

2. The method of block encryption with a private key according to claim 1, characterized in that the frequency ranges for transmitting and receiving blocks are set by a random number sensor.

3. The method of block encryption with a private key according to claim 1, characterized in that the code attribute, which indicates that this block contains random numbers, is generated by a random number sensor.

In the claimed method of block encryption with a private key, any known encryption and decryption method can be used, for example, gamming, etc. (Ivanov M.A. Cryptographic methods for protecting information in computer systems and networks. - M: KUDITS-OBRAZ, 2001, p. 34 )

The random number sensor can be implemented as a hardware device or software (Ermakov V.F., Gudzovskaya V.A. RU RU Random number sensor with a uniform distribution of increased accuracy, RF patent No. 2103726, G06F 7/58).

In the control device, control bits are formed and attached to each block, for example, a checksum, CRC (control redundancy code) - a cyclic redundancy code, etc. (see Henry S. Warren, ml. Algorithmic tricks for programmers - M .: Williams, 2007 .-- 288 p.). Data blocks can be monitored at the receiver using a hardware device or using a program, for example, using a checksum calculation algorithm, CRC, etc. The receiver calculates the check bits for the received blocks and compares them with the check bits attached to this block. If these control bits do not match, the receiver generates and transmits a receipt. The transmitter receives a receipt and repeats the transmission, starting with a distorted block.

Thus, the claimed method of block encryption of messages and transmission of encrypted data with a private key can be implemented in hardware, software or hardware-software based on a computer with software installed on it.

The features indicated in the independent claim are essential and interconnected with each other with the formation of a stable set of necessary features sufficient to obtain the required technical result.

The properties regulated in the claimed method by individual features are well known in the art and require no further explanation. It should be noted that the claimed combination of essential features provides a synergistic (super-total result) in the compound.

Thus, the above information indicates that when using the claimed method the following set of conditions:

- the claimed method has practical application, is intended for cryptographic protection of information transmitted over the air;

- for the claimed method in the form described in the independent clause of the formula below, the possibility of its implementation using the means and methods specified in the application or known from the prior art on the priority date is confirmed;

- when implementing the method is achieved perceived by the applicant technical result.

Based on the foregoing, the claimed method meets the requirements of the patentability conditions of “novelty” and “inventive step”.

Claims (3)

1. A method of block encryption with a private key, including dividing the message in the transmitter into a set of individual k-bit data blocks in an amount (N≥2), initializing the private key before transmitting the message (at i = 0) in the transmitter and receiver with the same private value key, generating a sequence of subkeys from the private key, followed by their encryption in the transmitter of the respective transmitted data blocks, block-by-block transmission of the generated data over the communication channel, and subsequent decryption of the transmitted data blocks in the receiver by means of the mentioned plug-ins, including various modifications, first, in the transmitter, the service information block containing the modifier of the (i + 1) -th closed subkey is connected to the (i) -th data block, then the data block and service information of the (i) -th subkey from the set of subkeys, after which control bits are formed and connected to the i-th transmitted block, then the (i) th block with control bits is transmitted to the receiver, where the correct (x) received ones are checked using the control bits -th block, after which the received (i) -th block is decrypted by the (i) -th closed subkey and it is divided into the i-th data block and (i) -th block of service information in the receiver from the (i) -th subkey and (i + 1) -th modifier form the value of the next (i + 1) -th closed subkey with the ability to decrypt the next (i + 1) -th block, and after transmitting, receiving and checking the correctness of each i-th transmitted block in the transmitter and the receiver synchronously set the new value of the private subkey from the set of subkeys of the private encryption key, after which the transmitter resumes transmitting the next (i + 1) -th data block with the (i + 2) -th modifier of the closed subkey, and a received message is formed from the correctly received data blocks in the receiver, characterized in that the data blocks in the transmitter are mixed with blocks containing random numbers, then after encryption the blocks are transmitted at different frequencies, and in the service information block the block number is transmitted, a code sign that indicates that this block contains random numbers, as well as a code that sets the transmission frequency for the next block, and in reception The units receive blocks at different frequencies, after decryption, the blocks containing random numbers are separated from the blocks containing data, then the blocks of data are sorted by numbers, and a message is formed from them, the receiver generates a receipt for each incorrectly received data block and transmits it over the air to transmitter. 2. The method of block encryption with a private key according to claim 1, characterized in that the frequency ranges for transmitting and receiving blocks are set by a random number sensor. 3. The method of block encryption with a private key according to claim 1, characterized in that the code attribute, which indicates that this block contains random numbers, is generated by a random number sensor.

Images