FIELD: radio communications and computer engineering; data transmission in computer networks over pseudorandom operating frequency control radio line. SUBSTANCE: on sending end input signal is divided into blocks, transmitter carrier frequency is controlled in compliance with codes of pseudorandom sequences set up by feedback shift register, transmitter carrier is modulated by respective burst, this being followed by radiation of this signal into environment, reception of this signal at receiving end of radio line at all frequencies at a time in compliance with code of pseudorandom sequences, choice of frequency channel involved in transmission, signal conversion into intermediate frequency, amplification, demodulation, and decoding of burst, and data signal supply to terminal device. Novelty is that all pseudorandom sequences are generated as pseudorandom sequences of finite character field Fp having characteristic p = 257 in the form of eight-bit binary vectors by reading out information from eight different places of shift register, and replacement of characters 0 by 256, sequential conversion of input-signal eight-bit blocks using finite-field pseudorandom character sequences, as well as linear or nonlinear cryptographic transformations including addition, multiplication, or exponentiation operations of characters in finite field Fp, and replacement of characters 0 by 256, modulation of transmitter carrier frequency by means of burst of input-signal converted blocs; carrier frequency control code is generated by relatively adding, multiplying, or exponentiating pseudorandom sequences of characters shaped in finite field Fp followed by modulo n reduction of numbers obtained, where n is number of frequency channels used. EFFECT: enhanced stability of communications at active intrusions; ensured privacy of data transmitted. 5 cl, 2 dwg
