Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

12-2010

Abstract

In a dynamic group key exchange protocol, besides the basic group setup protocol, there are also a join protocol and a leave protocol, which allow the membership of an existing group to be changed more efficiently than rerunning the group setup protocol. The join and leave protocols should ensure that the session key is updated upon every membership change so that the subsequent sessions are protected from leaving members (backward security) and the previous sessions are protected from joining members (forward security). In this paper, we present a new security model for dynamic group key exchange. Comparing to existing models, we do a special treatment to the state information that a user may use in a sequence of setup/join/leave sessions. Our treatment gives a clear and more concise definition of session freshness for group key exchange in the dynamic setting. We also construct a new dynamic group key exchange protocol that achieves strong security and high efficiency in the standard model.

Keywords

Group Key Exchange, Dynamic Group, Insider Security, Mutual Authentication, Strong Contributiveness

Discipline

Information Security

Research Areas

Cybersecurity

Publication

Cryptology and Network Security: 9th International Conference, CANS 2010, Kuala Lumpur, Malaysia, December 12-14: Proceedings

Volume

6467

First Page

261

Last Page

277

ISBN

9783642176180

Identifier

10.1007/978-3-642-17619-7_19

Publisher

Springer

City or Country

Cham

Additional URL

https://doi.org/10.1007/978-3-642-17619-7_19

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