| 摘要 |
There is provided a configuration capable of effectively preventing unauthorized use of an encrypted content stored in an information recording medium. Seed information (seed 2) required for generating a block key applied to decryption of the encrypted content is encrypted by a block key (Kb1) and stored. Furthermore, in the configuration requiring transfer of the seed information (seed 2) between devices, both of the seed information (seed 2) and a recording key (K2) are encrypted by a session key before transmission/reception. With this configuration, it becomes difficult to analyze the seed information (seed 2) by data acquisition from the information recording medium and the data transfer path. Thus, it is possible to realize a content protection of a high security level by increasing the difficulty of analysis of key information generated by using the seed information and analysis of the encryption algorithm.
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