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International Symposium on Information Theory and its Applications

Efficient ID-based key agreement protocol under the DLDH assumption without random oracles

Daisuke Moriyama, Hiroshi Doi

Published Dec 1, 2008• 2 citations
Publisher

Abstract

In this paper, we propose a two party ID-based key agreement protocol without random oracles. Our protocol is proven under the Decision Linear Diffie-Hellman assumption and the most efficient in the existing protocols proven secure without random oracles to the best of our knowledge.
DOI
10.1109/isita.2008.4895433

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The authors present an identity-based authenticated key agreement protocol without bilinear pairing in multiple PKG environments.Reduced to the standard computational Diffie-Hellman(CDH) assumption in the random oracle model,the protocol security is given a complete proof based on the security of proposed ID-based exponential challenge-response(XCR) signature scheme and dual challenge-response(DCR) signature scheme.Compared with previous identity-based authenticated key agreement protocols,the new protocol shows better performances.
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Most of the existing Identity-based(ID) authenticated protocols are proven secure in the Canetti-Krawczyk(CK) model which is weaker than the extended Canetti-Krawczyk(eCK) model.Based on NAXOS trick,a new scheme using bilinear pairing was proposed.The security of the scheme was proven in the eCK model under the random oracle assumption and the Gap Bilinear Diffie-Hellman(GBDH) assumption.The proposed protocol was efficient in computational cost and communication round when compared with other solutions.The new protocol also satisfied master key forward security,perfect forward security and anti-key-leak disguise.
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