Further Analysis of ID-Based Authenticated Group Key Agreement Protocol from Bilinear Maps*This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2005-217-C00002).

Authors:
Kyung-Ah Shim
Affiliations:
The author is with the Dept. of Mathematics, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-gu, Seoul, Republic of Korea. E-mail: kashim@ewha.ac.kr
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2007

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Abstract

Recently, Choi et al. proposed an ID-based authenticated group key agreement with bilinear maps. Subsequently, Zhang and Chen showed that the protocol does not provide authenticity as claimed by replaying transcripts of the past session. To prevent those replay attacks, they suggest adding a time parameter to the message being signed. However, despite of such a modification, we show that the protocol is still insecure against insider colluding attacks without replaying transcripts of the past session.