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Erschienen in:
2013 | OriginalPaper | Buchkapitel
A UC-Secure Authenticated Contributory Group Key Exchange Protocol Based on Discrete Logarithm
verfasst von : Yasser Sobhdel, Rasool Jalili
Erschienen in: Information Systems Security
Verlag: Springer Berlin Heidelberg
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Authenticated key exchange protocols allow parties to establish a common session key which in turn is fundamental to building secure channels. Authenticated group key exchange protocols allow parties to interact with each other and establish a common group session key and avoid peer to peer key exchange; in other words they pave the way to build a broadcast channel.
We construct an authenticated group key exchange protocol over UC framework which has the contributiveness property; i.e., the output is not biased by inputs of any party. Our protocol uses CRS model and discrete logarithm. Other protocols over UC framework either are defined over RO model [19] or benefit from a non-standard hardness assumption [16].