FIELD: communications. SUBSTANCE: device has transmission control unit, n encoders, m decoders, receiving control unit. Transmission control unit has register, OR gate, group of RS-flip- flops, AND gate, delay gate, computing unit, decoder, p generators, m double-input gates, group of OR gates. Encoder has first digital- to-analog converter, comparator, first delay gate, second delay gate, RS-flip-flop, AND gate, counter, second digital-to-analog converter, first shaper, second shaper, first and second encoders. Decoder has first and second decoders, RS-flip-flop, AND gate, counter, delay gate. Receiving control unit has six AND gates, group of RS-flip-flops, AND gate, delay gate, computing unit, encoder, p generators, m AND gates, m OR gates. EFFECT: increased protection of device from unauthorized access. 5 dwg
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