Patent ID: 7750793
Filing Date: 2010-07-06
Classification: G06K

Abstract:
1. A method for use in an RFID system comprising a plurality of RFID devices and at least one reader which communicates with one or more of the devices, the method comprising the steps of: receiving an identifier transmitted by a given one of the RFID devices; determining at least first and second codes, wherein the first code is a valid code for the identifier, and the second code is an invalid code for the identifier; communicating with the given device to determine if the device is able to confirm that the first code is a valid code and the second code is an invalid code; and designating the given device as an authenticated device only if the given device is able to confirm that the first code is a valid code and the given device is able to confirm that the second code is an invalid code; wherein the communicating step further comprises: sending the first code to the given device and receiving from the given device in response to the first code a corresponding first validity indicator; sending the second code to the given device and receiving from the given device in response to the second code a corresponding second validity indicator; and processing the first validity indicator received from the given device to determine if the given device is able to confirm that the first code is a valid code; and processing the second validity indicator received from the given device to determine if the given device is able to confirm that the second code is an invalid code.