| 摘要 |
FIELD: cryptography, possible use as separate element during construction of symmetric cryptographic systems, meant for transferring encrypted speech, sound, television and other messages. ^ SUBSTANCE: for realization of method at transferring side of communication guiding a random series is generated in form of three blocks X1,X2,X3 with lengths of k1,k2,k3 respectively. Series is transferred with errors via communication channel (Y1,Y2,Y3 - received blocks). Blocks of checking symbols C1 and C2 are formed for blocks X1 and X2. Message SC1+C2 is formed by concatenating blocks C1 and C2. Authenticator w for received message is formed, using a checking code and block Y3. Blocks of checking symbols C1 and C2 are selected from received message SC1+C2. from blocks Y1, Y2 received in advance via communication channel with errors and blocks of checking symbols C1 and C2 decoded blocks . Encryption/decryption keys are generated at receiving and transferring communication guiding sides by hashing block X1 at transferring communication guiding side and decoded block at receiving communication guiding side. ^ EFFECT: decreased time consumed by generation of encryption/decryption key, increased resistance of generated encryption/decryption key to discrediting by a violator. ^ 6 cl, 37 dwg |
