Patent ID: 7786866

Claim:
An RFID tag comprising: a transmitter adapted to transmit data to an RFID reader; a receiver adapted to receive data from the reader; a memory adapted to store identification data that unambiguously identifies the RFID tag; a memory adapted to store an internal password; a memory adapted to store information about an internal state of the RFID tag; a controller adapted to automatically execute functions if the reader demonstrates knowledge of an internal password stored in the memory adapted to store the internal password or if information stored in the memory adapted to store information about the internal state permits the execution of the functions, and circuitry adapted to change the stored password and/or the internal state in response to a comparison of the internal password to a password received from the reader; a non-transient and non-rewritable or rewritable memory adapted to store a verification value, and circuitry adapted to determine a test value from two input values and adapted to verify the identification data based on a value received from the reader and the verification value, wherein the data that the transmitter is adapted to transmit to the RFID reader includes data containing information about a result of the verification.