Cryptology ePrint Archive: Report 2009/313

Identity Based Group Signatures from Hierarchical Identity-Based Encryption

Nigel P. Smart and Bogdan Warinschi

Abstract: A number of previous papers explored the notion of identity-based group signature. We present a generic construction of identity-based group signatures. Our construction is based on the Naor transformation of a identity-based signature out of an identity-based encryption, adjusted to hierarchical identity-based encryption. We identify sufficient conditions on the underlying HIBE so that the scheme that results from our transformation meets our security definitions. Finally, we suggest a couple of extensions enabled by our construction, one of which is to hierarchical identity-based group signatures.

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Date: received 27 Jun 2009, last revised 1 Jul 2009

Contact author: nigel at cs bris ac uk

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Version: 20090701:152244 (All versions of this report)

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