Mutual information masking device

Abstract

The utility model relates to mutual information masking devices. The technical result is an increased level of security for transmitted information. The mutual information masking device comprises a key memory unit; first, second, third, and fourth multiplication units; first, second, third, and fourth summation units; first and second division units; and a first input of the device to which a first information signal is applied. 3 fig.

Description

[0001] The utility model relates to telecommunications and computing technology, to the field of methods and devices for steganographic data conversion, and can be used in communications, computing and information systems for steganographic concealment of information during data exchange between government, law enforcement, defense, banking and industrial institutions when there is a need to store and transmit confidential information.

[0002] A known radio masking device [1] can be considered as an analogue of the utility model, which contains a noise generator consisting of a system of two coupled oscillators, a capacitive coupling element between them, a radiating antenna and a low-frequency noise source. The first oscillator contains a nonlinear amplifier, a delay line and an inertial self-bias circuit. The output of the nonlinear amplifier is connected to the input via a delay line, the inertial self-bias circuit is connected between the common electrode of the active element of the nonlinear oscillator and the common bus. The second oscillator contains a nonlinear amplifier and an adjustable delay line. The output of the nonlinear amplifier is connected to the input via an adjustable delay line. The delay line provides adjustment of the position of the natural frequencies of this oscillator. The output of the first oscillator is connected to the input of the second oscillator using a capacitive coupling element. The element of the oscillatory system is a radiating antenna of the magnetic dipole type.The input of the first generator is connected to the output of a low-frequency noise source.

[0003] The disadvantage of the known device is the generation of noise by the receiving side, which limits the coverage area of ​​radio masking, as well as the use of the additive superposition principle, which reduces its resistance to attacks.

[0004] A device (prototype) for hiding information is known [2], containing first and second key memory blocks, first, second, third and fourth summation blocks, first, second, third, fourth, fifth, sixth, seventh and eighth multiplication blocks, an information transmission block and two division blocks, wherein the output of the first summation block is connected to the first input of the information transmission block, the output of the second summation block is connected to the second input of the information transmission block, the first output of the information transmission block is connected to the first input of the third multiplier, and the second output is connected to the first input of the fourth multiplier, the output of the third adder is connected to the first input of the first division block, the first input of the device, to which the first information signal is supplied, is connected to the first input of the first multiplier and to the first input of the sixth multiplier, the second input of the device, to which the second information signal is supplied,connected to the first input of the second multiplier and to the first input of the fifth multiplier, the first output of the first key memory block is connected to the second input of the first summation block, the second output of the first key memory block is connected to the second input of the second summation block, the third output of the first key memory block is connected to the second input of the first multiplier, the output of which is connected to the first input of the first summation block, the fourth output of the first key memory block is connected to the second input of the second multiplier, the output of which is connected to the first input of the second summation block, the fifth output of the first key memory block is connected to the second input of the fifth multiplication block, the output of which is connected to the third input of the first summation block, the sixth output of the first key memory block is connected to the second input of the sixth multiplication block, the output of which is connected to the third input of the second summation block,the first input of the seventh multiplier is connected to the second output of the data transmission unit, the first input of the eighth multiplier is connected to the first output of the data transmission unit, the first output of the second key memory unit is connected to the third input of the third summation unit, the second output of the second key memory unit is connected to the first input of the fourth summation unit, the third output of the second key memory unit is connected to the second inputs of the first and second division units, the fourth output of the second key memory unit is connected to the second input of the fourth multiplication unit, the output of which is connected to the second input of the fourth summation unit, the fifth output of the second key memory unit is connected to the second input of the third multiplication unit, and its output is connected to the first input of the third summation unit, the sixth output of the second key memory unit is connected to the second input of the seventh multiplication unit, the output of which is connected to the second, inverting input of the third summation unit,the seventh output of the second key memory block is connected to the second input of the eighth multiplication block, the output of which is connected to the third input of the fourth summation block, the output of which is connected to the first input of the second division block, the outputs of the first and second division blocks are the outputs of the device.

[0005] The disadvantage of the prototype is the linear model of mutual masking, due to the use of an algorithm based on the sum of linear functions of two signals.

[0006] The purpose of the utility model is to increase the level of security of transmitted information by using a nonlinear algorithm for mutual masking of information based on the relationship of the linear functions of two signals.

[0007] For this purpose, a known device comprising a key memory unit, first, second, third and fourth multiplication units, first and second summation units, the first input of the device to which the first information signal is supplied is connected to the first input of the first multiplication unit, the third and fourth summation units, the first and second division units are introduced, the second input of the device to which the second information signal is supplied is connected to the second input of the third multiplication unit and to the second input of the fourth multiplication unit, the first input of the second multiplication unit is connected to the first input of the device, the first output of the key memory unit is connected to the first input of the first summation unit and to the first input of the third summation unit, the second output of the key memory unit is connected to the second input of the first multiplication unit, the third output of the key memory unit is connected to the first input of the third multiplication unit,the fourth output of the key memory block is connected to the first input of the fourth summation block, the fifth output of the key memory block is connected to the first input of the second summation block, the sixth output of the key memory block is connected to the first input of the fourth multiplication block, the seventh output of the key memory block is connected to the second input of the second multiplication block, the output of the first multiplication block is connected to the second input of the first summation block, the output of the second multiplication block is connected to the second input of the second summation block, the output of the third multiplication block is connected to the second input of the third summation block, the output of the fourth multiplication block is connected to the second input of the fourth summation block, the output of the first summation block is connected to the first input of the first division block, the output of the second summation block is connected to the second input of the second division block, the output of the third summation block is connected to the first input of the second division block,the output of the fourth summation block is connected to the second input of the first division block, the output of the first division block is the first output of the device, the output of the second division block is the second output of the device.,

[0008] The technical results that will be obtained through the use of the utility model are an information concealment device that allows two useful signals to be masked, fully restored by the receiving party, provides flexibility in setting the device parameters, and ensures reliable information protection due to a nonlinear information concealment model.

[0009] Fig. 1 shows the structural diagram of the mutual information masking device.

[0010] The device contains a key memory block 1, multiplication blocks 2, 3, 4 and 5, four summation blocks 6, 7, 8 and 9, division blocks 10 and 11.

[0011] The device operates as follows [3].

[0012] The masked signals u1 and u2 are fed to the device input. Then, using an encoder comprising blocks 1–11, two signals y1 and y2 are generated and transmitted via the data transmission device. The mathematical description of the encoder is as follows:

[0013] (1).

[0014] According to (1), the key memory block transmits to the output the following values: C=1,a1,a2,b1,b2,c1,c2.

[0015] Reconstruction of signals u1 and u2 is performed using decoders. The first decoder allows signal u1 to be reconstructed using input signals y1 and y2. The mathematical model for reconstructing the first signal is as follows:

[0016] (2).

[0017] The structural diagram of the decoder is simplified by pre-calculating the coefficients in expression (2).

[0018] Let's define

[0019] (3);

[0020] (4);

[0021] (5).

[0022] Taking into account (3) and (4), expression (2) is transformed to the form:

[0023] (6).

[0024] The structural diagram of the first decoder is shown in Fig. 2 and contains a key memory block 12, multiplication blocks 13, 14, 15 and 16, summation blocks 17 and 18, division block 19. In accordance with (6), the key memory block transmits to the output, respectively, the values: K1, K2, K3, a2, c2.

[0025] To reconstruct the second signal u2, a second decoder is used. Signal y1 and the signal u1 extracted by the first decoder are fed to the input. The mathematical model of the second decoder is as follows:

[0026] (7).

[0027] The structural diagram of the second decoder is shown in Fig. 3 and contains a key memory block 20, multiplication blocks 21, 22 and 23, summation block 24, division block 25. In accordance with (7), the key memory block transmits to the output, respectively, the values: C, a1, b1, c1, where C=1.

[0028] Expression (1) is the mathematical model of the encoder, expressions (3-6) are the mathematical model of the first decoder, and expression (7) is the mathematical model of the second decoder.

[0029] The received signals y1 and y2 constitute a filled stegocontainer. A distinctive feature of the container formed in accordance with (1) is the presence of two signals containing common masking signals, which are information signals. This feature allows expressions (2) and (7) to be used to open the container.

[0030] Thus, the proposed device allows for the effective masking of two information signals and their transmission over a communication line with subsequent recovery.

[0031] List of sources

[0032] 1. Patent for invention No. 2170493. Russian Federation, IPC H04K. Radio masking device / V.A. Bezrukov, V.P. Ivanov, V.S. Kalashnikov, M.N. Lebedev / / (Russia); declared 15.05.2000; published 10.07.2001.

[0033] 2. Shakursky, M.V. Device for mutual masking of information / M.V. Shakursky / / Patent for utility model 235476 Russian Federation, IPC H04L 9 / 00. - declared 02 / 28 / 2025; published 07 / 03 / 2025 Bulletin No. 19.

[0034] 3. Shakursky, M.V. Two-channel information hiding system with mutual channel noise / M.V. Shakursky, V.K. Shakursky / / Radio Engineering. - 2016. - No. 2. - P. 96-99.

[0035] 4. Shakursky, M.V. Compressive mappings in invariant converters and steganography systems / V.K. Shakursky, M.V. Shakursky / / Monograph. Publishing House of the Scientific Center of the Russian Academy of Sciences, Samara 2014, 159 p.

Claims

A device for mutual masking of information, comprising a key memory unit, first, second, third and fourth multiplication units, first and second summation units, the first input of the device, to which the first information signal is supplied, is connected to the first input of the first multiplication unit, characterized in that third and fourth summation units, first and second division units are introduced into it, the second input of the device, to which the second information signal is supplied, is connected to the second input of the third multiplication unit and to the second input of the fourth multiplication unit, the first input of the second multiplication unit is connected to the first input of the device, the first output of the key memory unit is connected to the first input of the first summation unit and to the first input of the third summation unit, the second output of the key memory unit is connected to the second input of the first multiplication unit, the third output of the key memory unit is connected to the first input of the third multiplication unit,the fourth output of the key memory block is connected to the first input of the fourth summation block, the fifth output of the key memory block is connected to the first input of the second summation block, the sixth output of the key memory block is connected to the first input of the fourth multiplication block, the seventh output of the key memory block is connected to the second input of the second multiplication block, the output of the first multiplication block is connected to the second input of the first summation block, the output of the second multiplication block is connected to the second input of the second summation block, the output of the third multiplication block is connected to the second input of the third summation block, the output of the fourth multiplication block is connected to the second input of the fourth summation block, the output of the first summation block is connected to the first input of the first division block, the output of the second summation block is connected to the second input of the second division block, the output of the third summation block is connected to the first input of the second division block,the output of the fourth summation block is connected to the second input of the first division block, the output of the first division block is the first output of the device, the output of the second division block is the second output of the device.,

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