METHOD OF CODING/DECODING KEY CREATION Russian patent published in 2009 - IPC H04L9/00 

FIELD: physics, communications.

SUBSTANCE: invention concerns cryptography, particularly coding/decoding key creation, and can be applied as separate element in construction of symmetrical cryptographic systems for transmission of speech, sound, television and other messages. Substance of invention includes method of coding/decoding key creation involving random generation of original sequences in authorised communication directions, matching of original sequences, creation of primary sequences in authorised communication directions, sequential mismatching and repeated matching of original sequences in authorised communication directions for two times or more, creation of key sequences in authorised communication directions, creation of coding/decoding key in authorised communication directions by implementing simple protocol of key sequence compression in authorised communication directions.

EFFECT: enhanced protection of created coding/decoding key against compromising by attacker.

6 cl, 34 dwg