FIELD: control information protection in data links. SUBSTANCE: device that can be used in data link circuits at cryptographic transformations functions to generate bijective functions by series of n- binary elements of Galois field GF(2n), sequentially recorded in memory registers. Device has (2n) n- digit memory registers, (2n-2) OR gates, (2n-2) AND gates, 2(2n-2) INHIBIT gates, decoder, counter, and clock generator. EFFECT: enhanced data protection capabilities. 1 cl, 1 dwg
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