FIELD: electrical communications and computer engineering. SUBSTANCE: method involves generation of ciphering key in the form of combination of sub-keys, division of data block into N 2 sub-blocks, and sequential conversion of sub-blocks by executing double-point operation with sub-block and sub-key. Novelty is that prior to executing double-point operation with i-th sub-block and sub-key the latter is shifted in cyclic manner depending on j-th sub-block, where j is not equal to i. EFFECT: improved ciphering speed. 1 cl, 1 dwg
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