FIELD: radio communications; data encryption, decryption, and processing.
SUBSTANCE: interface-encrypted data are transferred with aid of digital video disk reproducing facility to personal computer and to magnetooptic disk unit through bus. Data received in magnetooptic disk unit where change of function is not open to user are decrypted by interface. In personal computer where change in function is open to user. Encrypted data are decrypted by means of interface using time-variable key, and result of decryption is additionally decrypted by means of application program slot using session key.
EFFECT: enhanced reliability of data protection.
37 cl, 24 dwg
