G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.86
G06F 1/04 (2006.01) G06F 1/00 (2006.01) G06F 9/00 (2006.01) G06F 9/46 (2006.01) G06F 21/00 (2006.01)
Patent
CA 2025518
PD89-0265 ABSTRACT OF THE DISCLOSURE A digital computer system for processing at least one process, said process generating operational requests for enabling selected operations. The computer sys- tem comprises a timer portion for generating two series of unpredictable timing in- dications. An operational processor portion is responsive to the timing indications from said timer and the operational requests for initiating operations enabled by the operational requests in response to one of the series of timing indications. The op- erational processor communicates with the processes regarding operations enabledwith respective operational requests in response to the second series of timing in- dications. Since the timings of the operations by the operational processor are dis- tinct from the timings of the communications between the operational processor and the process, the process is unable to determine timing information from the opera- tions performed by the operational processor in response to the operational re- quests, thereby ensuring that the process will be unable to use the timings of the op- erations by the operational processor to determine timing intervals. In another aspect, the digital computer system includes a system timing generator for generat- ing a system timing value that provides timing information. The system timing gen- erator updates the system timing value at unpredictable intervals, but so that the sys- tem timing value provides timing information that is accurate as of the time of up- date. When the process requests the system timing value, the system timing genera- tor supplies only a selected high-order portion of the system timing value, alsoensuring that the process only has imprecise timing information. Since the process has access to only an imprecise system timing value, and since it is unable to use ex- ternal operations, by the operational processor, for timing information, the band- width of any covert timing channels is reduced accordingly.
Hu Wei-Ming
Kahn Clifford E.
Karger Paul A.
Mason Andrew H.
Robinson Paul T.
Digital Equipment Corporation
Smart & Biggar
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