Certificateless authenticated two-party key agreement protocols

Authors:
Tarjei K. Mandt;Chik How Tan
Affiliations:
Norwegian Information Security Laboratory, Department of Computer Science and Media Technology, Gjøvik University College, Gjøvik, Norway;Norwegian Information Security Laboratory, Department of Computer Science and Media Technology, Gjøvik University College, Gjøvik, Norway
Venue:
ASIAN'06 Proceedings of the 11th Asian computing science conference on Advances in computer science: secure software and related issues
Year:
2006

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Abstract

In their seminal paper on certificateless public key cryptography, Al-Riyami and Paterson (AP) proposed a certificateless authenticated key agreement protocol. Key agreement protocols are one of the fundamental primitives of cryptography, and allow users to establish session keys securely in the presence of an active adversary. AP's protocol essentially requires each party to compute four bilinear pairings. Such operations can be computationally expensive, and should therefore be used moderately in key agreement. In this paper, we propose a new certificateless authenticated two-party key agreement protocol that only requires each party to compute two pairings. We analyze the security of the protocol and show that it achieves the desired security attributes. Furthermore, we show that our protocol can be used to establish keys between users of different key generation centers.