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Distance bounding protocols aim at avoiding relay attacks during an authentication process. Such protocols are especially important in RFID, where mounting a relay attack between a low-capability prover and a remote verifier is a realistic threat. Several distance bounding protocols suitable for RFID have been recently suggested, all of which aim to reduce the adversary's success probability and the number of rounds executed within the protocol. Peinado et al. introduced an efficient distance bounding protocol that uses the concept of void challenges. The authors present in this paper a generic technique called MUltiState Enhancement that is based on a more efficient use of void challenges. MUSE significantly improves the performances of the already-published distance bounding protocols and extends the void challenges to p-symbols.
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