Rfid reader revocation checking using low power attached displays

Abstract

A method of authenticating a radio frequency identification (RFID) reader to efficiently and timely check of revocation status of the RFID reader includes the steps of checking whether a given certificate is expired or revoked, and allowing a user of an RFID tag to verify that the credentials and revocation status information reported to the tag by reader is correct and current/valid before permitting information transmission from the RFID tag to the reader. An RFID tag includes a passively powered display and a user activatable control which allows the method to be carried out with the tag. The tag may include encrypted communication ability and automatic certificate revocation list checking. (This method is applicable not just to RFID but to any technology involving purely passive operation, i.e., where the tag obtains power from a reader).