Patent ID: 6075861
Filing Date: 2000-06-13
Classification: G06Q,G07C,G07F

Abstract:
A method of authenticating an authorization of access to a secure system/location through entry access control system in response to a protocol process, comprising the steps of:providing a user/prospective entrant with a system ID number and a personal PIN number;including the ID number and PIN number in a database accessible to the access entry control system;providing an identical encryption algorithm to both the user/prospective entrant and the access entry control system;storing the ID number and PIN number in a communication device in the possession of the user/prospective entrant;transmitting the ID number to the access entry control system from the communication device at the access entry control system receiving the transmitted ID number and generating an arbitrary multidigit number from the ID number;transmitting the arbitrary multidigit number to the communication device;at the communication device generating a check number with the encryption algorithm using the arbitrary multidigit number, and using the PIN number as a key;transmitting the check number generated at the communication device to the access entry control;generating a second check number at the access entry control system with the encryption algorithm using arbitrary multidigit number, using the PIN number as a key and comparing the check number generated at the communication device with the second check number generated at the entry access control system; andgranting access to the user/prospective entrant if the second check number is identical to the check number generated at the communication device.