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Prerequisites for Developing a Methodology for Estimating and Increasing Cryptographic Strength based on Many-Valued Logic Functions

Symmetric cryptographic algorithms are one of the most important components of information security systems, which determines the relevance of the task of estimation and further increasing of their efficiency. The rapid development of cryptanalysis methods, in particular, using the representation of structures of cryptographic algorithms based on manyvalued logic functions, and the development of quantum cryptanalysis methods, as well as the actual absence of a comprehensive theoretical apparatus for the estimation of cryptographic quality of many-valued logic component functions and synthesis methods for cryptographic constructs, which are high quality in terms of many-valued logic functions, create an objective contradiction in modern cryptography. In this paper, we represent the prerequisites for the development of a methodology for estimation of cryptographic strength based on many-valued logic functions, which is in turn based on the criteria and indicators of the cryptographic quality of many-valued logic functions, as well as methods for their calculation. We also present the results of applying the developed methodology to common block symmetric ciphers made it possible to identify a cryptographic quality reserve that can be obtained by improving their structure, considering the representation of their constructs using functions of many-valued logic.