Patent ID: 7298268
Filing Date: 2007-11-20
Classification: G06K

Abstract:
1. A process for maintaining security of information stored on a radio frequency identification (RFID) tag comprising the steps of: storing predetermined data on an RFID tag wherein said predetermined data is variable and includes therein information relating to a next key to be used in a rotating key authenticating system; interrogating said RFID tag with an RFID tag reader by providing a requesting key to said RFID tag, wherein said requesting key is a changing key in the rotating key authentication system; comparing said requesting key to a predetermined stored key and determining if a match exists; transmitting said predetermined data in response to and only if said match exists; determining if a particular reader is authorized to write to and lock predetermined portions of said predetermined data; wherein said determining if a particular reader is authorized to write is a separate and distinct process from said determining if a match exists.