Cryptology ePrint Archive: Report 2010/235

Attribute-based group key establishment

Rainer Steinwandt and Adriana Suárez Corona

Abstract: Motivated by the problem of establishing a session key among parties based on the possession of certain credentials only, we discuss a notion of attribute-based key establishment. A number of new issues arise in this setting that are not present in the usual settings of group key establishment where unique user identities are assumed to be publicly available. After detailing the security model, we give a two-round solution in the random oracle model. As main technical tool we introduce a notion of attribute-based signcryption, which may be of independent interest. We show that the type of signcryption needed can be realized through the encrypt-then-sign paradigm. Further, we discuss additional guarantees of the proposed protocol, that can be interpreted in terms of deniability and privacy.

Category / Keywords: cryptographic protocols / group key establishment, attribute-based cryptography, signcryption

Publication Info: to appear in Advances in Mathematics of Communications (AMC)

Date: received 26 Apr 2010

Contact author: adriana at orion ciencias uniovi es

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Version: 20100428:140029 (All versions of this report)

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