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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Security Weakness in Ren et al.’s Group Key Agreement Scheme Built on Secure Two-Party Protocols
verfasst von : Junghyun Nam, Seungjoo Kim, Dongho Won
Erschienen in: Information Security Applications
Verlag: Springer Berlin Heidelberg
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A group key agreement protocol is designed to allow a group of parties communicating over an insecure, public network to agree on a common secret key. Recently, in WISA’04, Ren et al. proposed an efficient group key agreement scheme for dynamic groups, which can be built on any of secure two-party key establishment protocols. In the present work we study the main EGAKA-KE protocol of the scheme and point out a critical security flaw in the protocol. We show that the security flaw leads to a vulnerability to an active attack mounted by two colluding adversaries.