| 摘要 |
An encryption system (1) for securely protecting digital video data or digital audio data from illegal copying. This system has an encryption device (10) and a decryption device (20). The encryption device includes: an A/D converter (2); a code setting unit (3) for separately generating a frame check code on first data of each of a plurality of frame data created by collecting unit data into chains; an encrypting unit (4) for creating chain encrypted data for each chain by sequentially performing an encryption processing, on the basis of the frame check code, using encryption results of previous unit data for encryption of next unit data; and an interface (5). The decryption device (20) includes an interface (6), a transfer starting unit (7)and a decrypting unit (8) for decrypting the encrypted data. |
