Cryptology ePrint Archive: Report 2005/013

Comments: Insider attack on Cheng et al.'s pairing-based tripartite key agreement protocols

Hung-Yu Chien

Abstract: Recently, Cheng et al. proposed two tripartite key agreement protocols from pairings: one is certificate-based and the other is identity-based (ID-based). In this article, we show that the two schemes are vulnerable to the insider impersonation attack and the ID-based scheme even discloses the entities¡¦ private keys. Solutions to this problem are discussed.

Category / Keywords: cryptographic protocols / elliptic curve cryptosystem, cryptanalysis, key escrow

Date: received 20 Jan 2005

Contact author: redfish6 at ms45 hinet net

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Version: 20050120:193435 (All versions of this report)

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