Constant-Round Password-Based Authenticated Key Exchange Protocol for Dynamic Groups

Authors:
Shuhua Wu;Yuefei Zhu
Affiliations:
Department of Networks Engineering, Zhengzhou Information Science Technology Institute, , Zhengzhou, China 450002;Department of Networks Engineering, Zhengzhou Information Science Technology Institute, , Zhengzhou, China 450002
Venue:
Financial Cryptography and Data Security
Year:
2008

Citing 15
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Abstract

In this paper, we extend the work of Abdalla et al. to take into account the notion of dynamicity in the membership and present an improved compiler that transforms any provably secure password-based authenticated 2-party key exchange into a more attractive password-based authenticated group key exchange. The resulting protocol is a provably secure and efficient dynamic password-based authenticated group key exchange protocol in a constant number of rounds. To the best of our knowledge, our proposal is the first solution to design constant-round password-based authenticated group key exchange protocols for dynamic groups. Furthermore, its security result does not assume the Random Oracle model or the ideal cipher model.