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Applied Cryptography and Network Security: 7th International by Mark Manulis (auth.), Michel Abdalla, David Pointcheval,

By Mark Manulis (auth.), Michel Abdalla, David Pointcheval, Pierre-Alain Fouque, Damien Vergnaud (eds.)

This publication constitutes the refereed lawsuits of the seventh foreign convention on utilized Cryptography and community safeguard, ACNS 2009, held in Paris-Rocquencourt, France, in June 2009.

The 32 revised complete papers offered have been rigorously reviewed and chosen from a hundred and fifty submissions. The papers are equipped in topical sections on key trade, safe computation, public-key encryption, community safety, traitor tracing, authentication and anonymity, hash fundtions, lattices, and side-channel attacks.

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Additional resources for Applied Cryptography and Network Security: 7th International Conference, ACNS 2009, Paris-Rocquencourt, France, June 2-5, 2009. Proceedings

Example text

In this attack, the adversary does not need to learn any long term private keys or ephemeral keys. – The attack is also valid in the CK model: the sessions are not partners for a number of reasons, for example because their choice of agents differs. Session 1 has {a, b} and session 2 has {b, z} where z is an arbitrary participant. Hence the adversary can choose z = a. 4 Discussion The structure of our attacks can be used to attack some protocols that were proven correct in the CK model [5]. We first briefly discuss these other protocols, and afterwards discuss the implications for existing proofs and protocol transformation theorems in the CK model.

This corresponds to the situation in which the longterm private keys reside in e. g. a tamper-proof module (TPM) or cryptographic coprocessor, while the remainder of the protocol computations are done in regular (unprotected) memory. The corresponding adversary ability is captured in security models for key agreement protocols by the Session-state Reveal query. A drawback of the Session-state Reveal query in current security models is that the query is often underspecified. For example, in the Canetti-Krawczyk (CK) model [5], Session-state Reveal is defined as giving the adversary the internal state of the Turing machine that executes the protocol.

3 Security Model and Applicable Protocols The pairing protocols, on which our methods are built, are based upon the following communication and adversarial model [26]. The devices being paired are connected via two types of channels: (1) a short-range, high-bandwidth bidirectional wireless channel and (2) one or more auxiliary low-bandwidth physical OOB channel(s). Based on the type of devices being used, the OOB channel(s) can be device-to-device (d2d), deviceto-human (d2h), or human-to-device (h2d).

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