Cryptography – Key management – Having particular key generator
Reexamination Certificate
2008-01-15
2008-01-15
Vu, Kim (Department: 2135)
Cryptography
Key management
Having particular key generator
C380S045000, C380S277000, C713S189000, C713S193000, C726S026000
Reexamination Certificate
active
07319752
ABSTRACT:
An information recording/playback device stores beforehand, on a recording medium, secret information in which a writing/reading method thereof cannot be analyzed and which can be read only by a special reading method. The secret information is applied to a key for content encryption or decryption when performing recording or playback of contents on the recording medium, such as music data and image data. The secret information is, for example, a stamper ID. By using the stamper ID as secret information, and a master key and a media key which are distributed in a tree-structure key-distribution system, a content-cryptosystem key is generated. Accordingly, each content is allowed to be used in only an appropriate device in which the special reading method for the secret information can be executed and to which the key is distributed by the tree-structure key-distribution system.
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Asano Tomoyuki
Osawa Yoshitomo
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Shaw Yin-Chen
Sony Corporation
Vu Kim
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