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Authors: Keita Emura 1 and Takashi Sato 2

Affiliations: 1 National Institute of Information and Communications Technology (NICT), Japan ; 2 Japan Advanced Institute of Science and Technology (JAIST), Japan

ISBN: 978-989-8565-24-2

Keyword(s): Group Key Exchange, On-demand Computation of Subgroup Keys.

Related Ontology Subjects/Areas/Topics: Applied Cryptography ; Authentication ; Cryptographic Techniques and Key Management ; Data Engineering ; Databases and Data Security ; Information and Systems Security ; Obstacles ; Security in Distributed Systems ; Security Protocols ; Sensor Networks

Abstract: In AFRICACRYPT2010, Abdalla, Chevalier, Manulis, and Pointcheval proposed an improvement of group key exchange (GKE), denoted by GKE+S, which enables on-demand derivation of independent secret subgroup key for all potential subsets. On-demand derivation is efficient (actually, it requires only one round) compared with GKE for subgroup (which requires two or more rounds, usually) by re-using values which was used for the initial GKE session for superior group. In this paper, we improve the Abdalla et al. GKE+S protocol to support key randomization. In our GKE+S protocol, the subgroup key derivation algorithm is probabilistic, whereas it is deterministic in the original Abdalla et al. GKE+S protocol. All subgroup member can compute the new subgroup key (e.g., for countermeasure of subgroup key leakage) with just one-round additional complexity. Our subgroup key establishment methodology is inspired by the “essential idea” of the NAXOS technique. Our GKE+S protocol is authenticated key e xchange (AKE) secure under the Gap Diffie-Hellman assumption in the random oracle model. (More)

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Paper citation in several formats:
Emura, K. and Sato, T. (2012). Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization.In Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012) ISBN 978-989-8565-24-2, pages 353-357. DOI: 10.5220/0003986003530357

@conference{secrypt12,
author={Keita Emura. and Takashi Sato.},
title={Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization},
booktitle={Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012)},
year={2012},
pages={353-357},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003986003530357},
isbn={978-989-8565-24-2},
}

TY - CONF

JO - Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012)
TI - Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization
SN - 978-989-8565-24-2
AU - Emura, K.
AU - Sato, T.
PY - 2012
SP - 353
EP - 357
DO - 10.5220/0003986003530357

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