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This paper proposes a lightweight RFID authentication protocol that supports forward and backward security. The only cryptographic mechanism that this protocol uses is a PseudoRandom Number Generator (PRNG) that is shared with the backend Server. Authentication is achieved by exchanging a few numbers (3 or 5) drawn from the PRNG. The lookup time is constant, and the protocol can be easily adapted to prevent online man-in-the-middle relay attacks. Security is proven in the UC security framework.
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