Patent ID: 7788490

Claim:
A method for sending an authentication response from an article to a verifier system, comprising: storing a challenge phrase in a first memory location on the article, wherein the challenge phrase is received from the verifier system; retrieving a message authentication code from a second memory location on the article, wherein the message authentication code is stored in the second memory location at the time of manufacturing of the article; generating a combinational logic gate output of the challenge phrase and the message authentication code by using only a single logic gate operation; sending the generated combinational logic gate output of the challenge phrase and the message authentication code in response to receiving a read request for the second memory location from the verifier system; retrieving a serial number identifier stored on the article, wherein the serial number identifier is stored on the article at the time of manufacturing of the article; sending the serial number identifier to the verifier system in response to a request for the serial number identifier from the verifier system; storing a second challenge phrase in a third memory location on the article, wherein the second challenge phrase is received from the verifier system; retrieving a second message authentication code from a fourth memory location on the article, wherein the second message authentication code is stored in the fourth memory location at the time of manufacturing of the article; and sending a second combinational logic gate output of the second challenge phrase and the second message authentication code in response to receiving a read request for the fourth memory location from the verifier system.