METHOD FOR ITERATIVE ENCRYPTING OF BINARY DATA BLOCKS Russian patent published in 2000 - IPC

FIELD: electrical communications and computer engineering. SUBSTANCE: method involves shaping ENCRYPTING key in the form of combination of m-bit sub-keys, dividing data block into two n-bit sub-blocks L and R, executing N 2 ENCRYPTING rounds each including computation of round function F by shaping sub-block R and at least one m-bit sub- key of n-bit binary vector V₁ for each sub-block and conversion of binary vector V₁, as well as superposing round function F onto sub-block L using two-position operation. Novelty is that computation of round function F involves, in addition, shaping at least one more binary vector V₂ and that value of round function F is shaped using converted values of binary vectors V₁ and V₂. Novelty is also that binary vectors V₁ and V₂ are converted in turn. One more novelty is that binary vectors V₁ and V₂ are shaped simultaneously. Apart from that, novelty is that binary vectors V₁ and V₂ are used to shape extended binary vector and that the latter is subjected to exchange operation. EFFECT: reduced number of ENCRYPTING rounds which raises ENCRYPTING speed. 4 cl, 4 dwg