METHOD FOR BLOCK DATA ENCRYPTION Russian patent published in 1998 - IPC

FIELD: electric communication, computer engineering, in particular, cryptographic method and equipment. SUBSTANCE: method involves generation of encryption key as set of sub-keys, splitting data block into sub- blocks and subsequent application of binary operations to sub-keys and sub-blocks. In addition method involves generation of binary vector and application of l-th sub-key to i-th sub-block B_i, where i = 1,2,3...,N,N≥2 - and l = 1,2,3,...,K,K≥8 is number of sub-keys. Sub-key number l is based on value of binary vector. Binary vector conforms to structure of j-th sub-block B_j, where j = 1,2,3,...,N, and i ≠ j or to structure of j-th sub-block B_j, where i ≠ j, and number of sub-key which has been applied to sub-block in previous step. EFFECT: increased speed of encoding of software ciphers. 3 cl, 2 dwg