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Modeling Leakage of Ephemeral Secrets in Tripartite/Group Key Exchange

Manulis, M, Suzuki, K and Ustaoglu, B (2009) Modeling Leakage of Ephemeral Secrets in Tripartite/Group Key Exchange In: 12th International Conference on Information, Security, and Cryptology (ICISC 2009), 2009-12-02 - 2009-12-04, Seoul, Korea.

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Recent advances in the design and analysis of secure two-party key exchange (2KE) such as the leakage of ephemeral secrets used during the attacked sessions remained unnoticed by the current models for group key exchange (GKE). Focusing on a special case of GKE — the tripartite key exchange (3KE) — that allows for efficient one-round protocols, we demonstrate how to incorporate these advances to the multi-party setting. From this perspective our work closes the most pronounced gap between provably secure 2KE and GKE protocols. The proposed 3KE protocol is an implicitly authenticated protocol with one communication round which remains secure even in the event of ephemeral secret leakage. It also significantly improves upon currently known 3KE protocols, many of which are insecure. An optional key confirmation round can be added to our proposal to achieve the explicitly authenticated protocol variant

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Computer Science
Authors : Manulis, M, Suzuki, K and Ustaoglu, B
Date : 2009
DOI : 10.1007/978-3-642-14423-3_2
Contributors :
Additional Information : The original publication is available at
Depositing User : Symplectic Elements
Date Deposited : 11 Jun 2013 16:07
Last Modified : 06 Jul 2019 05:12

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