Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2006-12-22
2008-08-19
Vu, Kimyen (Department: 2135)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S164000, C713S165000, C713S166000, C713S167000, C713S168000, C713S189000, C726S002000, C726S010000, C726S018000, C726S026000, C726S027000
Reexamination Certificate
active
07415620
ABSTRACT:
In accordance with certain aspects, a chain of trust is established between a subscriber unit and a content provider. A request is submitted from the subscriber unit to the content provider. A challenge nonce is generated at the content provider and returned to the subscriber unit. At the subscriber unit, an operating system (OS) certificate containing an identity of the operating system from the software identity register, information describing the operating system, the challenge nonce, and a CPU public key is formed, and the OS certificate is signed using a CPU private key. The OS certificate and a CPU manufacturer certificate supplied by a manufacturer of the CPU are passed from the subscriber unit to the content provider, and are evaluated at the content provider to determine whether to reject or fulfill the request.
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DeTreville John D.
England Paul
Lampson Butler W.
Dada Beemnet W
Microsoft Corporation
Vu Kimyen
LandOfFree
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