SYSTEM OF SECRET TRANSMISSION AND RECEPTION OF VOICE INFORMATION, SYSTEM OF SYNCHRONIZATION FOR SYSTEM OF SECRET TRANSMISSION AND RECEPTION OF VOICE INFORMATION AND INFORMATION CODING OF DECODING DEVICE FOR SYSTEM OF SECRET TRANSMISSION AND RECEPTION OF VOICE INFORMATION Russian patent published in 1997 - IPC

FIELD: secret communication, applicable in communication, computing and information systems for cryptographic closing of binary information. SUBSTANCE: a random initial state of cryptoalgorithms is provided at the beginning of communication session due to randomization of the secret key by a random sync pulse shaped from the cryptogram of transmitted data. Realized is an original system of synchronization of the moments of start of coding and decoding cryptoalgorithms in the process of organization of communication combining the procedures of synchronization and transmission of a random sync pulse to the party. The offered device differs from the known devices of secret communication (for example, device based on the data coding standard of the US National Bureau of Standards) by possibility of byte coding of binary information with the use of a key, having a length required for the user. It makes it attractive for use in secret communication system. EFFECT: simplified realization and enhanced cryptographic security. 4 cl, 4 dwg