Cryptology ePrint Archive: Report 2012/504

Scalable Deniable Group Key Establishment

Kashi Neupane and Rainer Steinwandt and Adriana Suarez Corona

Abstract: The popular Katz-Yung compiler from CRYPTO 2003 can be used to transform unauthenticated group key establishment protocols into authenticated ones. In this paper we present a modi cation of Katz and Yung's construction which maintains the round complexity of their compiler, but for "typical" unauthenticated group key establishments adds authentication in such a way that deniability is achieved as well. As an application, a deniable authenticated group key establishment with three rounds of communication can be constructed.

Category / Keywords: Group key establishment, Deniability

Publication Info: This is the full version of the work to appear in Proceedings of 5th International Symposium on Foundations & Practice of Security

Date: received 31 Aug 2012

Contact author: asuarezc at fau edu

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Version: 20120903:130520 (All versions of this report)

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