| 摘要 |
PROBLEM TO BE SOLVED: To provide an encryption/decryption device which can protect content data, even under repeated trials, and to provide an electronic apparatus and an encrypting/decrypting method. SOLUTION: The encryption/decryption device comprises a circuit for encrypting/decrypting content data, in accordance with a first algorithm, a circuit 12 for decrypting encryption/decryption information according to a second algorithm, when the encryption/decryption information stored in an external memory in a state of being encrypted, in accordance with the second algorithm is read out from the external memory, and a circuit for determining the propriety added to the encryption/decryption information. The encryption/decryption circuit 16 encrypts/decrypts the content data, based on the encryption/decryption information decrypted by the decryption circuit by determining the propriety added to the encryption/decryption information. COPYRIGHT: (C)2007,JPO&INPIT
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