Patent ID: 8443437

Claim:
A method of operating a security system comprising: providing an identity card for use by a person entering a secured area of the security system; a first card reader reading the identity card at a point of physical entry of the person into the secured area; a random number generator of the security system randomly generating an alphanumeric key upon the occurrence of a predetermined event; the first card reader writing the alphanumeric key into the identify card at the entry point; a second card reader reading the card within the secured area as a request for access to a computer; a logical access control system granting access to the computer by the person, when an alphanumeric key is found on the card that matches the generated alphanumeric key; and the logical access control system denying access to the computer by the person when an alphanumeric key is found on the card that does not match the generated alphanumeric key; wherein the predetermined event further comprises reading of the identity card at the entry point and wherein any preexisting alphanumeric keys are deleted each time an alphanumeric key is written into the identify card.