Trusted system clock
First Claim
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1. For use with a system clock that keeps a system time, a method comprising detecting a possible attack against the system clock, and updating a status store to indicate a possible attack against the system clock.
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Abstract
Methods, apparatus and computer readable medium are described that attempt increase trust in a system time provided by a system clock. In some embodiments, a detector detects activities that may be associated with attacks against the system clock. Based upon whether the detector detects a possible attack against the system clock, the computing device may determine whether or not to trust the system time provided by the system clock.
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Citations
39 Claims
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1. For use with a system clock that keeps a system time, a method comprising
detecting a possible attack against the system clock, and updating a status store to indicate a possible attack against the system clock.
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10. A chipset comprising
a status store to indicate whether a possible attack against a system clock was detected, and a detector to detect a possible attack against the system clock and to update the status store based upon whether a possible attack against system clock was detected.
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18. A computing device comprising
memory to store a interrupt service routine for system timer interrupts, a system timer to generate system timer interrupts that invoke execution of the interrupt service routine, a processor to update a system time of a system clock in response executing the interrupt service routine, and a detector to detect a possible attack against the system clock.
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26. A machine-readable medium comprising a plurality of instructions that in response to being executed result in a computing device
determining that an attack against a system clock of the computing device has been detected, and responding to the attack against the system clock.
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34. An apparatus comprising
an update store to indicate whether an update to a system clock is pending, and detection logic to detect a possible attack against the system clock based upon the update store and one or more system timer interrupts used to invoke an update of the system clock.
Specification