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This paper first discusses the security threats that have to be addressed when dealing with lightweight RFID protocols: in particular, privacy/integrity attacks that compromise the forward and backward security of tags. The authors then analyze some recently proposed EPCGen2 com-pliant protocols. Finally, this paper proposes a lightweight RFID authentication protocol that supports session unlinkability with forward and backward security. The only cryptographic mechanism that this protocol uses is a synchronized pseudoRandom Number Generator (RNG) that is shared with the backend Server.
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