Welcome to the resource topic for 2003/259
Title:
Attack on Two ID-based Authenticated Group Key Agreement Schemes
Authors: Fangguo Zhang, Xiaofeng Chen
Abstract:Authenticated group key agreement problem is important in many modern collaborative and distributed applications. Recently, there are two ID-based authenticated group key agreement schemes have been proposed, one is Choi et\ al.'s \cite{CHL04} scheme, the other is Du et\ al.'s \cite{Du03} scheme. They are all constructed from bilinear pairings based on Burmester and Desmedt scheme \cite{BD94}. In this paper, we propose an impersonation attack on the two schemes. We show that any two malicious users can impersonate an entity to agree some session keys in a new group if these two malicious users have the previous authentication transcripts of this entity. So, the two ID-based authenticated group key agreement schemes can not provide the authenticity as claimed. We propose a proposal to repair these schemes.
ePrint: https://eprint.iacr.org/2003/259
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