Boots – shoes – and leggings
Patent
1992-01-14
1993-06-15
Chan, Eddie P.
Boots, shoes, and leggings
395650, 395575, 364270, 3642702, 3642704, 3642718, 3642225, 3642864, 3649187, 3649343, 3649505, 364DIG1, 364DIG2, G06F 1300
Patent
active
052206610
ABSTRACT:
A digital computer system for processing at least one process, said process generating operational requests for enabling selected operations. The computer system comprises a timer portion for generating two series of unpredictable timing indications. 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 operational processor communicates with the processes regarding operations enabled with respective operational requests in response to the second series of timing indications. Since the timings of the operations by the operational processor are distinct from the timings of the communications between the operational processor and the process, the process is unable to determine timing information from the operations performed by the operational processor in response to the operational requests, thereby ensuring that the process will be unable to use the timings of the operations by the operational processor to determine timing intervals. In another aspect, the digital computer system includes a system timing generator for generating a system timing value that provides timing information. The system timing generator updates the system timing value at unpredictable intervals, but so that the system timing value provides timing information that is accurate as of the time of update. When the process requests the system timing value, the system timing generator supplies only a selected high-order portion of the system timing value, also ensuring 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 external operations, by the operational processor, for timing information, the bandwidth of any convert timing channels is reduced accordingly.
REFERENCES:
patent: 4115867 (1978-09-01), Vladimirov et al.
patent: 4328542 (1982-05-01), Anastas et al.
patent: 4819164 (1989-04-01), Branson
patent: 4823262 (1989-04-01), Calle
Lipner; A Comment On The Confinement Problem; The Mitre Corporation; pp. 192-196.
Cohen; A Secure Computer Network Design; Computers & Security; 4:189-205; 1985.
Girling; Covert Channels in LAN's; IEEE Transactions on Software Engineering; SE13:292-296; 1987.
Huskamp; Covert Communication channels in Timesharing Systems; Computer Science; University of California; May 1978.
Tsai; Covert-channel analysis in secure computer systems; UMI; 1987.
Lampson; A Note on the Confinement Problem; Communications of the ACM; 16:613-615; Oct. 1973.
Hu Wei-Ming
Kahn Clifford E.
Karger Paul A.
Mason Andrew H.
Robinson Paul T.
Chan Eddie P.
Digital Equipment Corporation
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