Cryptology ePrint Archive: Report 2009/495

Security Weakness in Two Authenticated Key Exchange Protocols

Qingfeng Cheng and Chuangui Ma

Abstract: In ICA3PP 2009, Xinglan Zhang proposed two one-round authenticated key exchange protocols and proved their security in the standard model. In this paper, we analyze these two protocols and find that both of them exist some flaws.

Category / Keywords: cryptographic protocols / authenticated key exchange, KCI attack, EKC attack

Date: received 9 Oct 2009

Contact author: qingfengc2008 at sina com

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Version: 20091014:190414 (All versions of this report)

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