Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2008-07-15
2008-07-15
Zand, Kambiz (Department: 2134)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C725S025000, C725S026000, C725S027000, C725S028000, C725S029000, C725S030000, C725S031000, C713S193000
Reexamination Certificate
active
07401232
ABSTRACT:
A key management apparatus which can be used to encrypt/decrypt content data in a content playback device includes a storing unit for storing a secret key, a key information decrypting unit for decrypting encrypted key information and an updating unit operable to update the secret key with an algorithm stored therein, when the decrypted key information is key-updating information. Seed information can be received for use with the algorithm to provide a new secret key, and preliminary trigger information can be used to poll a group of appliances to request key information to determine any duplication of appliances.
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Inoue Tetsuya
Kumazaki Yoji
Murakami Hiroki
Ohmori Motoji
Ono Takatoshi
Bayou Yonas
Matsushita Electric - Industrial Co., Ltd.
Zand Kambiz
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