## CryptoDB

### Paper: Attack on Two ID-based Authenticated Group Key Agreement Schemes

Authors: Fangguo Zhang Xiaofeng Chen URL: http://eprint.iacr.org/2003/259 Search ePrint Search Google 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.
##### BibTeX
@misc{eprint-2003-11972,
title={Attack on Two ID-based Authenticated Group Key Agreement Schemes},
booktitle={IACR Eprint archive},
keywords={Authenticated group key agreement,Bilinear pairings, ID-based cryptography, Attack},
url={http://eprint.iacr.org/2003/259},
note={ fangguo@uow.edu.au 12405 received 17 Dec 2003, last revised 19 Dec 2003},
author={Fangguo Zhang and Xiaofeng Chen},
year=2003
}