Cryptology ePrint Archive: Report 2005/131

Dynamic Group Key Agreement in Tree-Based Setting

Ratna Dutta and Rana Barua

Abstract: We present a provably secure tree based authenticated group key agreement protocol in dynamic scenario. Bilinear pairing and multi-signature are at the heart of our protocol. We prove that our protocol is provably secure in the standard security model of Bresson et al. An appropriate modification of Katz-Yung approach to tree based setting is adopted while proving its security against active adversaries. The protocol has an in-built hierarchical structure that makes it desirable for certain applications.

Category / Keywords: cryptographic protocols / bilinear pairing, multi-signature, group key agreement, dynamic operations, provable security

Publication Info: Accepted in ACISP 2005, to appear

Date: received 3 May 2005, last revised 5 May 2005

Contact author: ratna_r at isical ac in

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Version: 20050505:101712 (All versions of this report)

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