Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Having particular address related cryptography
Reexamination Certificate
2005-03-15
2010-11-16
Dada, Beemnet W (Department: 2435)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Having particular address related cryptography
C713S164000, C713S165000, C713S166000, C713S167000, C713S189000, C713S193000
Reexamination Certificate
active
07836299
ABSTRACT:
A virtual PCR (VPCR) construct is provided that can be cryptographically tagged as optionally resettable or as enduring for the life of a client (process, virtual machine, and the like) and that can be loaded into a resettable hardware PCR to make use of the functionality of a Trusted Platform Module (TPM). The VPCRs may cryptographically reflect their characteristics (resettable or not) in their stored values. Also, since the PCRs are virtualized, they are (effectively) unlimited in number and may be given general names (UUIDs) that are less likely to collide. The VPCRs can be loaded into a physical PCR as needed, but in a way that stops one piece of software from impersonating another piece of software. The VPCRs thus enable all software using the TPM to be given access to TPM functionality (sealing, quoting, etc.) without security concerns.
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England Paul
Setzer Matthew C.
Dada Beemnet W
Microsoft Corporation
Schwartz Darren
Woodcock & Washburn LLP
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