Cryptology ePrint Archive: Report 2006/013

Comments on a Provably Secure Three-Party Password-Based Authenticated Key Exchange Protocol Using Weil Pairings

Hung-Yu Chien

Abstract: In 2005, Wen et al. proposed the first provably secure three-party password-based authenticated key exchange using Weil pairings, and provided their proof in a modified Bellare-Rogaway model (BR-model). Here, we show an impersonation attack on Wen et al.s scheme and point out a main flaw of their model that allows a man-in-the-middle adversary easily violate the security.

Category / Keywords: cryptographic protocols / weil pairing, random oracle, authenticated key exchange

Date: received 11 Jan 2006

Contact author: redfish6 at ms45 hinet net

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Version: 20060112:085005 (All versions of this report)

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