FIELD: physics; communication.
SUBSTANCE: invention relates to communication engineering and is meant for ensuring confidentiality of messages sent over transmission lines. The method of encrypting and decrypting a message involves converting a message from a first form M to a second form M', its separation for further encryption in accordance with a separating code, scrambling the message for further encryption in accordance with a scrambling code, transmitting the message from the encryption device to a reception device, computation of the scrambling code and syntax analysis of the encrypted message for reverse conversion of the scrambling code and combining the messages, as well as converting the message from the second form M' to the first form M. The system for encrypting and decrypting a message comprises corresponding apparatus for three-phase message encryption, descrambling apparatus for computation of the scrambling code and syntax analysis of the encrypted massage for reverse conversion of the scrambling pattern, combination apparatus for computation of the separation code and syntax analysis of the encrypted message for combining the messages, as well as second apparatus for converting messages from the second form M' to the first form M.
EFFECT: protection of incoming messages and preventing interception and decryption by unauthorised parties.
40 cl, 9 dwg
