Patent ID: 6768428
Filing Date: 2004-07-27
Classification: G06F

Abstract:
In a computer system that includes a central processing unit and a keyboard for entry of user information, a keyboard lock that is inserted between said computer central processing unit and said computer keyboard, and that controllably enables said keyboard's communication of depressed keys, said keyboard lock comprising:(a) central processing unit electrical buffer to controllably enable said central processing unit's communications to said keyboard, said central processing unit electrical buffer enabled when said keyboard's communications are not occurring; (b) lock control circuitry that monitors said keyboard's communications to detect: (1) key communications resulting from depressed keys of said keyboard, (2) response communications resulting from said keyboard's response to said central processing unit's communications, (3) a predetermined first and second combination of depressed keys of said keyboard; (c) keyboard electrical buffer to controllably enable said keyboard's communications to said central processing unit, said keyboard electrical buffer disabled for said key communications after said lock control circuitry detects said first combination of depressed keys and enabled for all manner of said keyboard's communications after said lock control circuitry detects said second combination of depressed keys; whereby a user can prevent unintended entry of information into said computer system by using said combinations of depressed keys to alternately enable and disable said keyboard's communications of depressed keys to said central processing unit.