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In this paper, the authors present a security weakness of a forward secure authentication protocol proposed by Tri Van Le et al. called O-FRAP which stands for Optimistic Forward secure RFID Authentication Protocol. In particular, the authors point out that in the O-FRAP protocol, the server can be subject to a denial-of-service attack due to a flaw in the database querying procedure. Their attack also applies to a simplified version of O-FRAP called O-RAP (Optimistic RFID Authentication Protocol) which is essentially O-FRAP but without a secret key updating procedure (and thus forward security).
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