Computer security system

Details Computer security system Computer security system

1993-01-21

1994-10-11

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 36470905, 364DIG1, 364DIG2, 3642342, 3649282, H04L 932, G06F 1312

Patent

active

053554140

ABSTRACT:
A computer security device for preventing unauthorized access to a computer system automatically disables peripheral device access to the computer system after the peripheral input devices remain inactive for a predetermined period. The system comprises a host computer which is in communication with a keyboard controller and a display. The keyboard controller is in communication with one or more peripheral input devices such as a keyboard and a mouse. The computer security device operates in the keyboard controller, independent from the host. The keyboard controller activates security after a preset time period during which the mouse and keyboard remain inactive. When the security is active, the keyboard controller disables transfers to the host computer from the peripheral input devices. In order to re-enable peripheral device access to the host computer, a user enters a correct password on the keyboard. In a preferred embodiment, the display is also deactivated when security is active. Thus, if the user leaves a computer station, any information which was displayed on the screen is not viewable.

REFERENCES:
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 5173940 (1992-12-01), Lantz et al.
Intel 80C51SL-AG Keyboard Controller product data, Sep. 1990.

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