Provably secure password-authenticated group key exchange with different passwords under standard assumption

Authors:
Fengjiao Wang;Yuqing Zhang
Affiliations:
National Computer Network Intrusion Protection Center and State Key Laboratory of Information Security, GUCAS, Beijing, P.R. China;National Computer Network Intrusion Protection Center and State Key Laboratory of Information Security, GUCAS, Beijing, P.R. China
Venue:
Inscrypt'09 Proceedings of the 5th international conference on Information security and cryptology
Year:
2009

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Abstract

Although many password-authenticated group key exchange protocols have been proposed in recent years, it remains a non-trivial task to establish strong provable security guarantees without making idealized assumptions. In this paper, blending the best of a variant EKE scheme and Burmester-Desmedt (BD) group key exchange protocol, we present a provable secure and efficient different password-authenticated group key exchange (DPWA) protocol of three-round in the multicast setting. Based on the previous works, we first give a strengthened security model for this case, and then provide a security proof of our protocol in this model under the standard assumption.