METHOD FOR ITERATIVE BLOCK ENCRYPTION OF DIGITAL DATA Russian patent published in 2002 - IPC

FIELD: electrical communications and computer engineering; cryptographic methods for data encryption. SUBSTANCE: method involves encryption of private key, division of data block into two sub- blocks, and execution of R≥2 encryption rounds including generation of binary vector, conversion of binary vector under private key control, and superposition of converted binary vector onto second block by means of addition operation; control code is generated during each round and first sub-block is converted by means of first controlled operation depending on control code value; mentioned first sub-block is then converted by means of second controlled operation depending on control key value; binary vector is generated with respect to first sub-block converted by means of first controlled operation; control code is shaped with respect to private key and also control code is shaped with respect to private key and with respect to second sub-block value; used as second controlled operation is two-space controlled operation which is reverse to first controlled operation; used as first and second controlled operations are controlled exchanges and also two-space controlled operations are used as first and second controlled operations. EFFECT: reduced number of encryption rounds thereby increasing encryption speed. 6 cl, 3 dwg