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Published in:
2006 | OriginalPaper | Chapter
A New Key Exchange Protocol Based on MQV Assuming Public Computations
Authors : Sébastien Kunz-Jacques, David Pointcheval
Published in: Security and Cryptography for Networks
Publisher: Springer Berlin Heidelberg
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Designing authenticated key exchange algorithms is a problem well understood in cryptography: there are established security models, and proposals proved secure in these models. However, models currently used assume that a honest entity involved in a key exchange is trusted as a whole. In many practical contexts, the entity is divided in an
authentication device
storing a private key and having low computing power, and a
computing device
, that performs part of the computations required by protocol runs. The computing device might be a PC connected to the Internet, and the authenticating device a smart card. In that case as well in many others, a compromise of the computing device is to be expected. We therefore propose a variant of the MQV and HMQV key exchange protocols secure in that context, unlike the original protocols. The security claim is supported by a proof in a model derived from the Canetti-Krawczyk one, which takes into account more general rogue behaviours of the computing device.