Approach to constructing symmetric cryptographic systems ensuring specified resilience to cryptoanalysis over the long-term time horizon

The paper presents the results of an analysis of the decrease in cryptographic strength of the most common symmetric ciphers, taking into account the development of cryptanalytic methods. The vector of the threat to the reduction of information confidentiality stored and processed in information systems in the long term has been determined.
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Approach to constructing symmetric cryptographic systems ensuring specified resilience to cryptoanalysis over the long-term time horizon