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

Authors:
Fangguo Zhang
Xiaofeng Chen
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URL: http://eprint.iacr.org/2003/259
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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.
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
}