FIELD: communication equipment, in particular, telephone communication for transmission of confidential information. SUBSTANCE: method involves hiding information to be transmitted by means of adding noise to transmission line in working frequency band and subsequent information processing at receiving part by means of subtraction of reference signal produced by noise generator from signal mix of transmitting station and noise generator. Respective device has noise generator, which operates in working frequency band and is connected to transmitting user's line, two-channel digital adaptive filter and commutator. First input of filter is connected to transmitting user's line through analog-to-digital converter. Its second input is connected to output of noise generator. Its second input is connected to output of noise generator. Output of filter is connected to receiving user's line through digital-to-analog converter. EFFECT: temporal-to-spectral and reverse converting prior to subtraction of reference and mix signals. 4 cl, 1 dwg
