METHOD FOR ENCRYPTION/DECRYPTION OF ANALOGUE SIGNALS, TRANSMITTED OVER COMMUNICATION CHANNELS Russian patent published in 2016 - IPC H04K1/02 H03M13/01 G06F21/60 

FIELD: information technology.

SUBSTANCE: invention relates to information security. Method of encryption/decryption of analogue signals, consisting of flow areas with n-multiple digital data sampling cycles as per Kotelnikov consists in the fact that when encrypting from flow of incoming data dimension n-cycles quantisation encryption frame is formed from said n-quantisation cycles by means of calculation operations a sufficient quantity of coded quantisation cycles, having characterised by from other cycles quantisation encryption frames then, encryption frames are subject to relative moving the order of their repetition in accordance the encryption key representing an array of set of control codewords this algorithm cryptographic coding and in step-by-step mode to-analogue conversion in the form of a continuous flow inseparably following encryption frames is supplied to the communication channel, as-like output analogue signal. At the receiving side of the communication channel q: decryption process data flow starts from the mode of step-by-step operations cycles quantisation for searching for and extracting from a stream of incoming data encryption frame using the corresponding encryption key distribution coded quantisation cycles with distinctive features. In these step-by-step search operations and determining frame coding process is used for calculating the correlation function of coincidence of sets of code words keys transmitting and receiving sides, the array of set of code words decryption key is a cryptographic algorithm decoding received encrypted data. After determination of flow of incoming data encryption and frame match set of code words keys, is carried out by forming to-analogue conversion of recovered decoded output of analogue signals of voice communication. To protect codes encryption key from possible reading and "breaking" at the inlet of the transmitting channel provides for a special program digital a filtration flow data, possibility to use a large number of versions of encryption keys.

EFFECT: technical result is high level of cryptographic protection taking processes from their interception due to usage of cryptographic algorithms of coding.

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