PROCESS OF BLOCK CIPHERING OF DISCRETE DATA Russian patent published in 1999 - IPC

FIELD: electric communication, computer engineering, ciphering of data by cryptographic processes and devices. SUBSTANCE: proposed process includes formation of ciphering key in the form of collection of subkeys, breaking of data block into N≥2 subblocks and conversion of subblocks in turn by implementation of two-position operation with subblock and subkey. Process differs from traditional methods by realization of substitution operation with subkey depending on j-th subblock, where j≠i, before implementation of two-position operation with i-th subblock and subkey. EFFECT: increased speed of ciphering. 3 dwg