Keyboard password lock

Details Keyboard password lock Keyboard password lock

1990-05-18

1992-03-17

Gregory, Bernaar E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 23, 380 49, 34082531, 34082534, H04L 932, G06F 1314

Patent

active

050975064

ABSTRACT:
A keyboard controller or interface with scans entered key sequences for a key sequence activating a keyboard lock feature. A password and particular hot key are loaded by the system microprocessor. The keyboard interface then scans untl the designated sequence is activated. All keyboard activity is blocked from the system microprocessor until a password sequence is entered. Codes releasing some of the key strokes in the activation sequence are transmitted and normal operation, including activation sequence scanning, resumes. The password mode may be directly activated on command from the system microprocessor.

REFERENCES:
patent: 4523271 (1985-06-01), Levien
patent: 4740890 (1988-04-01), William
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 4951249 (1990-08-01), McClung et al.
patent: 4959860 (1990-09-01), Watters et al.
Televideo 950 . . . User's Guide (4/82) pp. 2-5, 4-4 4-5.

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