METHOD FOR CRYPTOGRAPHIC CONVERSION OF DIGITAL DATA BLOCKS Russian patent published in 1999 - IPC

FIELD: electrical communications and computer engineering. SUBSTANCE: method involves generation of block for each of N≥2 binary vectors, sequential conversion of binary vectors, and shaping of cryptogram block using converted binary vectors. Novelty is that control code V is additionally generated and during conversion of at least one binary vector the latter is subjected to at least one controlled two-way operation depending on value of control code V. Novelty is also that secret key is additionally generated and control code V is shaped according to secret key. One more novelty is that secret key is additionally generated and control key V is shaped according to current value of data block being converted. EFFECT: increased number of operations depending on converted block which raises stability of cryptographic conversion. 4 cl, 5 dwg, 5 tbl, 9 ex