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Title:
Provably Secure Distance-Bounding: an Analysis of Prominent Protocols
Authors: Marc Fischlin, Cristina Onete
Abstract:Distance-bounding protocols prevent man-in-the-middle attacks by measuring response times. Recently, Dür-holz et al.~\cite{DueFisKasOne11} formalized the four attacks such protocols typically address: (1) mafia attacks, where the adversary must impersonate to a verifier in the presence of an honest prover; (2) terrorist attacks, where the adversary gets some offline prover support to impersonate; (3) distance attacks, where provers claim to be closer to verifiers than they really are; and (4) impersonation security, where adversaries impersonate provers during lazy phases. \Duerholz\ et al.~\cite{DueFisKasOne11} also formally analyzed the security of (an enhanced version of) the construction of Kim and Avoine~\cite{KimAvo09}. In this paper, we quantify the security of some other well-known distance-bounding protocols, i.e.: Brands and Chaum~\cite{BrandsChaum93}, Hancke-Kuhn~\cite{HanKuhn05}, Avoine and Tchamkerten~\cite{AvTcham09}; Reid et al.~\cite{ReidGonzTangSen07}, the Swiss-knife protocol~\cite{KimAvoKoeStaPer09}, and the very recent proposal of Yang, Zhuang, and Wong~\cite{YangZhuWong12}. In particular, our main results show that (1) relating responses to a long-term secret key, as is the case for most protocols aiming to thwart terrorist fraud attacks, may make protocols vulnerable to so-called key-learning mafia fraud attacks, where the adversary learns a key bit-by-bit, by flipping a single time-critical response; (2) though relating responses can be a bad idea for mafia fraud, it sometimes enforces distance-fraud resistance, by thwarting in particular the attack of Boureanu et al.~\cite{Vau12}; (3) none of the three allegedly terrorist-fraud resistant protocols, i.e.~\cite{KimAvoKoeStaPer09,ReidGonzTangSen07,YangZhuWong12}, is in fact terrorist fraud resistant; for two of these protocols this is a matter of syntax, i.e.~they do not meet the strong security requirements given by \Duerholz\ et al.; the attack against the third protocol, i.e.~\cite{YangZhuWong12}, however, is almost trivial; (4) due to the absence of a second authentication phase, the protocol of Yang, Zhuang, and Wong is vulnerable to Denial of Service attacks. In light of our results, we also review definitions of terrorist fraud, arguing that, while the strong model in~\cite{DueFisKasOne11} may be at the moment more appropriate than the weaker intuition, it may in fact be too strong to capture terrorist fraud resistance.
ePrint: https://eprint.iacr.org/2012/128
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