Cryptology ePrint Archive: Report 2009/300

Universally Composable Contributory Group Key Exchange

M. Choudary Gorantla and Colin Boyd and Juan Manuel Gonz\`alez Nieto

Abstract: We treat the security of group key exchange (GKE) in the universal composability (UC) framework. Analyzing GKE protocols in the UC framework naturally addresses attacks by malicious insiders. We define an ideal functionality for GKE that captures contributiveness in addition to other desired security goals. We show that an efficient two-round protocol securely realizes the proposed functionality in the random oracle model. As a result, we obtain the most efficient UC-secure contributory GKE protocol known.

Category / Keywords: cryptographic protocols / Group Key Exchange, Contributiveness, Universal Composition

Publication Info: AsiaCCS 2009

Date: received 22 Jun 2009

Contact author: mc gorantla at isi qut edu au

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Version: 20090624:071436 (All versions of this report)

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