FIELD: generation of encryption key sequences for safe data transmission. SUBSTANCE: proposed invention is designed for generation and change of encryption keys affording protection of data transmitted using characteristics of radio communication channel, that is, for short-time reciprocity and fast spatial decorrelation of radio channel phase. Encryption keys may be generated using calculations similar to limited-distance decoding procedure. Alternative algorithm is developed for generation and division of key sequences depending on physical processes which provides for dispensing with generation of pseudorandom value during each session because desired random value is ensured due to transient time and space of communication channel. Probability of generating similar encryption keys by two users is reduced to unity and probability of obtaining same key by person interested in bugging is brought to zero. EFFECT: reduced bugging susceptibility. 30 cl, 9 dwg
