| 摘要 |
An encryption/decryption system (116) encrypts/decrypts digital data (21) including pairs of header information (HD) and a data body (PD). The system (116) includes an encryption work key generation unit (101, 102), an encryption unit (104), a decryption work key generation unit (106, 107), and a decryption unit (108). The encryption work key generation unit (101, 102) generates an encryption work key (WK) based on the header information (HD) for each data body. The encryption unit (104) encrypts each data body (PD) using a corresponding encryption work key. The decryption work key generation unit (106, 107) generates decryption work key (WK) for each data body based on the corresponding header information (HD). The decryption unit (108) decrypts the encrypted data body (EPD) of the encrypted digital data using a corresponding decryption work key (WK), and reproduce the digital data (21). <IMAGE> |
