Article

Article title INVESTIGATION OF A CRYPTOGRAPHIC STRENGTH AND CRYPTANALYSIS METHODS FOR THE NEURAL NETWORK ALGORITHM OF A SYMMETRIC ENCRYPTION
Authors V.N. Gridin, V.I. Solodovnikov
Section SECTION III. METHODS OF ADAPTATION AND NEURAL NETWORK ALGORITHMS
Month, Year 07, 2016 @en
Index UDC
DOI DOI 10.18522/2311-3103-2016-7-114122
Abstract A prerequisite for the neural networks use as a mathematical basis for the cryptographic in-formation protection methods could be distinguished their ability to restore the distorted signals and recognize objects with differences from the reference characteristics. An additional advantage includes the hardware realizability of neural network algorithms, which increases speed of data encryption and decryption. One of the main problems that hinder the advancement of neural net-work encryption methods is the insufficiently studied reliability issues that make it urgent to study the characteristic features and vulnerabilities of the neural network cryptographic algorithms. The article investigates the questions of the neural networks usage for cryptographic information pro-tection. Algorithms for encryption, decoding and data preprocessing were proposed. The encryption algorithm is based on the generation of different variants of the distorted code that could be restored and identified by the used network. Moreover, the formation of the neural network uses the information on the frequency of occurrence of the source alphabet symbols, which makes it difficult to apply the methods of frequency cryptanalysis. At the stage of decryption the neural network classifies the input encrypted signals and converts them into source symbols. Thus, the proposed algorithm belongs to a symmetric cipher, since key encryption and decryption is a neural network itself, specifically the selected paradigm, its parameters and structural characteristics. The mathematical model of the neural network algorithm for symmetric encryption was carried out. Also it was noted the similarity of neural network algorithm with the proportional replace cipher, but with the feature characteristic of neural network data processing methods. The classical methods of cryptanalysis and their applicability in relation to the neural network algorithm were analyzed. Possible directions of cryptanalysis, as well as ways to improve the reliability have been offered. It should be noted that more prolonged and expert analysis of the algorithm and its implementation were conducted, then more accurate its cryptographic strength could be assumed.

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Keywords Neural network; cryptographic protection; encryption; decryption; cryptographic strength; cryptanalysis.
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