Computer system key and lock protection mechanism

Details Computer system key and lock protection mechanism Computer system key and lock protection mechanism

G - Physics

11

C

354/243

G11C 7/00 (2006.01) G06F 12/14 (2006.01) G06F 13/00 (2006.01)

Patent

CA 1181180

ABSTRACT OF THE DISCLOSURE A computer virtual memory system key-lock mechanism providing for a variety of key-lock tests and key changes depending on the type of in- struction involved. This key-lock mechanism provides the opportunity for users to share use of programs and data in conjunction with the keys and locks assigned to individual users by the facility manager. The mechanism prevents unauthorized access to data and programs simultaneously present within the computer. The invention is mechanized by use of tables which record the keys and locks associated with each segment of data or code. Hardware tests each data or code segment access for compatibility between the keys and locks and causes the memory reference to be rejected if disagreement exists. The keys and locks are short digit sequences associated with the user and referenced segments.

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