| 摘要 |
An encrypted data production device (101) encrypts encryption object data including a plurality of frame data in a cipher block chaining mode using a cipher chaining unit of an arbitrary data length. A frame length/cipher chaining analysis section (114) produces, from AV data management information, additional information headers, each of which corresponds to one of the frame data and includes a frame header for the frame data. An encryption/decryption processing section (109) encrypts the frame data in a cipher block chaining mode to produce a series of a plurality of encrypted data. A header analysis/addition section (118) associates one of the plurality of encrypted data that includes therein a boundary between nth frame data and (n+1)th frame data with the additional information header corresponding to the (n+1)th frame data, and adding the additional information header at a predetermined position.
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