A deniable group key establishment protocol in the standard model

Authors:
Yazhe Zhang;Kunpeng Wang;Bao Li
Affiliations:
State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, China;State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, China;State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, China
Venue:
ISPEC'10 Proceedings of the 6th international conference on Information Security Practice and Experience
Year:
2010

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Abstract

We propose a deniable group key establishment protocol in the standard model. In a deniable group key establishment protocol, the transcript of the protocol session can not be used to prove the involvement of the participant in the protocol session. In other words, the participant can deny that she has joined in the protocol session which she has actually joined in. We figure out that the deniable group key establishment protocol should has the group deniable authentication characteristic, which implies authentication in the protocol execution and deniability after the protocol execution. We give a new definition of the group key establishment deniability in this paper. It is an extension of the definition given by Jens-Matthias Bohli and Rainer Steinwandt. We construct our deniable group key establishment protocol by using a variant of Schnorr’s zero-knowledge identification scheme and Burmester’s group key establishment protocol.