Identity-Based Key Agreement Protocols in a Multiple PKG Environment
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.
KeywordsID-based cryptosystem bilinear map key agreement protocol multiple PKG
Unable to display preview. Download preview PDF.
- 7.Zhang, F., Liu, S., Kim, K.: ID-Based One Round Authenticated Tripartite Key Agreement Protocols with Pairings. Crypology ePrint Archive, Report 2002/122Google Scholar
- 9.Cheng, Z., Vasiu, L., Comley, R.: Pairing-Based One-Round Tripartite Key Agreement Protocols. Cryptology ePrint Archive, Report 2004/079Google Scholar
- 10.Chen, L., Kudla, C.: Identity-based Authenticated Key Agreement Protocols from Pairings. Cryptology ePrint Archive, Report 2002/184Google Scholar