Cryptology ePrint Archive: Report 2010/082

Predicate-Based Key Exchange

James Birkett and Douglas Stebila

Abstract: We provide the first description of and security model for authenticated key exchange protocols with predicate-based authentication. In addition to the standard goal of session key security, our security model also provides for credential privacy: a participating party learns nothing more about the other party's credentials than whether they satisfy the given predicate. Our model also encompasses attribute-based key exchange since it is a special case of predicate-based key exchange.

We demonstrate how to realize a secure predicate-based key exchange protocol by combining any secure predicate-based signature scheme with the basic Diffie-Hellman key exchange protocol, providing an efficient and simple solution.

Category / Keywords: cryptographic protocols / predicate-based, attribute-based, key exchange, security models, protocols

Date: received 15 Feb 2010, last revised 16 Feb 2010

Contact author: douglas at stebila ca

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Version: 20100217:010828 (All versions of this report)

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