G - Physics – 06 – F
Patent
G - Physics
06
F
354/241
G06F 1/04 (2006.01) G06F 11/34 (2006.01) G06F 21/00 (2006.01) G07C 1/00 (2006.01)
Patent
CA 1080365
A B S T R A C T A data security system employing an automatic time-stamping mechanism for stamping a time accrued in a data storage area or register associated with each envelope or block of a memory or for each data channel of an auxiliary storage device, such that each access or data updates the appropriate time stamp in the memory of storage device. A first instruction provides the fetch of the time stamp with regard to the main memory, and a second instruction provides the fetch with regard to information contained in the data channel corresponding to the auxiliary storage device. For every envelope of a memory, there is a time stamp tag register associated with it. Similarly, there is a time stamp register associated with every data channel. Whenever an envelope of memory is accessed, the time stamp in the form of a unique binary number from a clock, indicating the time of day, is inserted into the tag register associated with that envelope. Examination of the contents of each tag register enables determination of whether there has been access to an envelope up to the present time. A full memory address register is used to access data in the memory while only special high order bits of the memory address register are used to access the time stamp associated with the envelope. The system provides a mechanism which automatically marks blocks of data as they are accessed and cannot be bypassed by altering the program.
266860
Belady Laszlo A.
Evangelisti Carlo J.
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