A security system includes a central console, one or more locks, one or more console coded programmers to transport data in a secure manner between the central console and one or more of the locks and one or more enabling programmers to enable the lock to operate upon insertion of a special key into...http://www.google.fr/patents/US4558175?utm_source=gb-gplus-shareBrevet US4558175 - Security system and method for securely communicating therein
Security system and method for securely communicating therein
