Use of mini-versions to evaluate the security of block-symmetric ciphers

Development of cryptology in the era of high technologies is closely connected with the formation of new approaches and methodologies that allow us to evaluate the security of the used block symmetric ciphers (BSC) to the main types of attacks of linear and differential cryptanalysis, taking into account the basic requirements for the speed of crypto-transformations and energy costs for implementation. Proposed in 2010 a new ideology of assessing the durability of block symmetric ciphers to attacks of differential and linear analysis by the scientists of the Department of BIT KhNURE under the guidance of Professor I. Gorbenka. Is oriented on the use of expected indicators of the durability of large ciphers based on the analysis of the indicators of their reduced versions on the one hand and developed on the basis of studying the properties and indicators of random substitutions and reduced models of ciphers considered as substitution transformations, on the other hand, differential and linear cryptanalysis. To overcome the difficulties of analyzing full-scale cryptographic models (algorithms), it is proposed to develop and study indicators of reduced prototype models (16-bit mini versions are used), for which the available computing capabilities are sufficient. However, the issue of using mini-versions to assess the cryptographic strength of full ciphers is not supported by all scientists. To assess the use of reduced models on the basis of the proposed methodology, the article presents the results of studies based on the mini versions (16 bit and 32 bits) of the Rijndael algorithms, Labirint, Kalina, Mukhomor cipher, ADE, used as experimental confirmation of the correctness of the proposed methodology And evaluation concepts, the main indicators of S-blocks of mini versions.