FIELD: physics.
SUBSTANCE: invention relates to information security. Disclosed is a method of cryptographic coding of digital data represented by binary bit sequences, consisting in the fact that for their cryptographic coding the method of encoding analogue signals is used, when corresponding to quantization cycles zero and single bit sequences of presented digital data are subjected to coding with three-bit binary code, for example zero bit of sequence - three-bit binary code 1 (001), and single bit sequence - three-bit binary code 3 (011), then obtained thus sequence of binary digital data are subjected to analogue cryptographic coding method using wherein necessary value of encryption frames, consisting of pulse-code-modulated (PCM) sequences of initial binary digital data.
EFFECT: technical result is providing high level of cryptographic protection of digital data from their interception.
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