| 摘要 |
PROBLEM TO BE SOLVED: To provide an encryption apparatus and method capable of preventing the leakage, copying, etc., of the decryption key of encrypted contents to the outside, a data decryption apparatus and method as well as a data memory system. SOLUTION: The data memory system 1 is formed as data memory means that a memory device 2 stores the encrypted data and the decryption key K for data for decryption of the encrypted data as an encrypted state in order to encrypt the decryption key for the data for decryption of the data and store the same in the memory device 2. The data decryption apparatus 5 is formed as a cipher means for encrypting the secret Ks which is used for decryption of the decryption key ks(K) for the encrypted data described above and is held by itself and the decryption key K for the data described above in accordance with individual ID which is the identification information intrinsically attached to the memory device 2. |
