Wireless proximity detector security feature

Details Wireless proximity detector security feature Wireless proximity detector security feature

1996-04-30

1999-10-19

Le, Dieu-Minh

Cryptography

Key management

Having particular key generator

380 4, 380 25, 34082532, H04L 900

Patent

active

059702273

ABSTRACT:
A security system for computers defines a control zone using radiation, preferably at radio frequency, having a distinctive characteristic, such as a particular frequency. The zone may be established, for example, at a door exit or other limited passage to a secured area. Computer systems are provided with receivers that detect the distinctive characteristic and responsively produce an alarm signal which triggers security logic. The security logic cooperates with the start-up logic of the computer and disables start-up so that the computer becomes inoperative. In a more complex variation, the radiation triggers a device in the computer that in turn sends out a serial number signal. A receiver located near the control zone applies the serial number to a table look up computer that triggers an emergency signal if a match to an authorized list of serial numbers does not occur. The emergency signal activates a transmitter that sends out a radiation signal with a second distinctive characteristic. A second receiver in the computer then responds to the radiation with the second characteristic to trigger the security logic to render the computer inoperative.

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