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Provably Secure Password-Authenticated Group Key Exchange with Different Passwords under Standard Assumption

  • Fengjiao Wang
  • Yuqing Zhang
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6151)

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.

Keywords

group key establishment password-based authentication provable security dictionary attacks 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Fengjiao Wang
    • 1
    • 2
  • Yuqing Zhang
    • 1
    • 2
  1. 1.National Computer Network Intrusion Protection CenterGUCASBeijingP.R. China
  2. 2.State Key Laboratory of Information SecurityGUCASBeijingP.R. China

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