FIELD: information technology.
SUBSTANCE: block cipher with common key processing configuration is implemented with improved immunity against such attacks as saturation attacks and algebraic attacks ("РЯС" attack). In the encryption processing device which executes processing of block cipher with common key, S-blocks used as modules of nonlinear transformation processing in round function and installed in round functions execution modules are made capable to use S-blocks of at least two different types. With such configuration, immunity against saturation attacks can be improved. Additionally, types of S-blocks represent mixture of various types.
EFFECT: increased difficulty of cryptanalysis and implementation of highly protected algorithm of block cipher with common key.
14 cl, 19 dwg
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