PROCESS OF CRYPTOGRAPHIC CONVERSION OF DATA BLOCKS Russian patent published in 1998 - IPC

FIELD: electric communication, computer engineering, methods and devices for cryptographic conversion of data blocks. SUBSTANCE: process involves formation of encoding key in the form of assemblage of subkeys, break-down of data block into subblocks and successive conversion of subblocks. In agreement with process binary vectors of two types are formed in addition, 1-th subkey, where 1= 1,2,3, ...,K, K ≥ 8 8 is number of subkeys is superimposed on binary vector of first type with the aid of binary operation, binary vector of first type is superimposed with the use of binary operation on i-th subblock B_i, where i=1,2, 3, ..., N, N N ≥ 22 is number of subblocks. Number 1 of subkey is chosen by value of binary vector of second type. Binary vector of first type is formed, for instance, by structure of j-th subblock B_j, where j=1,2,3,...,N. Binary vector of second type is formed for example, by structure of binary vector of first type. EFFECT: enhanced speed of cryptographic conversion when computer is used. 5 cl, 3 dwg