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Secure clock on computing device such as may be required in connection with a trust-based system

  • US 20030233553A1
  • Filed: 06/13/2002
  • Published: 12/18/2003
  • Est. Priority Date: 06/13/2002
  • Status: Active Grant
First Claim
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1. A computing device having:

  • a running real-time secure clock that can only be adjusted according to trusted time as received from a trusted time authority external to the computing device, whereby a user of the computing device cannot adjust the secure clock;

    a time offset within which is stored a time value that can be adjusted by at least one of the user and the trusted time authority; and

    a time display for displaying a running real-time display time to the user of such computing device, the display time being calculated as the trusted time from the secure clock plus the stored time value in the time offset. wherein reference 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.

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