Secure clock on computing device such as may be required in...

Details Secure clock on computing device such as may be required in... Secure clock on computing device such as may be required in...

2006-12-05

2006-12-05

Vu, Kim (Department: 2135)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S600000, C726S002000, C726S026000, C705S051000, C705S059000, C380S274000

Reexamination Certificate

active

07146504

ABSTRACT:
A computing device has a running real-time secure clock adjustable only according to trusted time as received from an external trusted time authority, a time offset within which is stored a time value adjustable by at least one of the user and the trusted time authority, and a time display for displaying a running real-time display time calculated as the trusted time from the secure clock plus the stored time value in the time offset. Reference thus may be made to the secure clock to evaluate a temporal requirement without concern that the user has adjusted the secure clock to subvert the temporal requirement. The computing device sends a request for secure time and the trusted time authority sends same. The computing device receives the secure time, sets the secure clock according to same, and sends confirmation to the trusted time authority that the secure time has been received.

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