Cryptography – Key management
Reexamination Certificate
2008-03-25
2011-12-13
Najjar, Saleh (Department: 2492)
Cryptography
Key management
C380S201000, C380S045000
Reexamination Certificate
active
08077871
ABSTRACT:
A content processing apparatus includes a read unit which reads encrypted key information from a recording medium, a decryption unit which decrypts the encrypted key information with a device key and dynamic information to obtain key information containing content keys, an update unit which updates the dynamic information, a key information processing unit which updates the key information by extracting a content key corresponding to a move target content from the key information, and removing the content key from the key information, a first encryption unit which encrypts the updated key information with the device key and the updated dynamic information, a second encryption unit which encrypts the content key with a shared key, and a write unit which overwrites the updated encrypted key information on the encrypted key information in the medium and writes the encrypted content key in the medium.
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Bone Dustin
Kabushiki Kaisha Toshiba
Najjar Saleh
Ohlandt Greeley Ruggiero & Perle L.L.P.
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