METHOD FOR GENERATING ENCRYPTION/DECRYPTION KEY Russian patent published in 2002 - IPC

FIELD: cryptography; building symmetrical cryptographic systems. SUBSTANCE: method involves simultaneous generation of received random sequence and primary random one on receiving and sending ends of route, respectively, generation of source and noisy source sequences on receiving end of route, error-free transmission of noisy source sequence over backward communication channel to sending end of route, encoding of source sequence, discrimination of check character block from encoded source sequence, its error-free transmission over backward channel, generation of decorated sequence and sequence hashing function on sending end of route, error-free transmission of hashing function over forward communication channel to receiving end of route, and generation of encryption/decryption keys on receiving and sending ends of route by hashing source and decorated sequences using generated sequence hashing function, erasing of primary random , received random, source, and decorated sequences. EFFECT: enhanced resistance of generated encryption/decryption key to compromise. 4 cl, 35 dwg