Identity-Based key agreement protocols in a multiple PKG environment

Authors:
Hoonjung Lee;Donghyun Kim;Sangjin Kim;Heekuck Oh
Affiliations:
Department of Computer Science and Engineering, Hanyang University, Republic of Korea;Department of Computer Science and Engineering, Hanyang University, Republic of Korea;School of Internet Media Engineering, Korea University of Technology and Education, Republic of Korea;Department of Computer Science and Engineering, Hanyang University, Republic of Korea
Venue:
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and Its Applications - Volume Part IV
Year:
2005

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Abstract

To date, most identity-based key agreement protocols are based on a single PKG (Private Key Generator) environment. In 2002, Chen and Kudla proposed an identity-based key agreement protocol for a multiple PKG environment, where each PKG shares identical system parameters but possesses a distinct master key. However, it is more realistic to assume that each PKG uses different system parameters. In this paper, we propose a new two party key agreement protocol between users belonging to different PKGs that do not share system parameters. We also extend this protocol to a tripartite key agreement protocol. Our two party protocol requires the same amount of pairing computation as Smart's protocol for a single PKG environment and provides PKG forward secrecy. We show that the proposed key agreement protocols satisfy every security requirements of key agreement protocols.