Cryptology ePrint Archive: Report 2003/113

Security Analysis of Shim's Authenticated Key Agreement Protocols from Pairings

Hung-Min Sun and Bin-Tsan Hsieh

Abstract: Recently, Shim proposed a tripartite authenticated key agreement protocol from Weil pairing to overcome the security flaw in Joux's protocol. Later, Shim also proposed an ID-based authenticated key agreement protocol which is an improvement of Smart's protocol in order to provide the forward secrecy. In this paper, we show that these two protocols are insecure against the key-compromise impersonation attack and the man-in-the-middle attack respectively.

Category / Keywords: cryptographic protocols / Cryptanalysis, Weil Pairing, ID-based, Key Agreement, Authentication

Date: received 2 Jun 2003, last revised 11 Jun 2003

Contact author: bintsan at csie ncku edu tw

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Note: amend some typos

Version: 20030611:153011 (All versions of this report)

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