Cryptology ePrint Archive: Report 2005/313

Deterministic Identity-Based Signatures for Partial Aggregation

Javier Herranz

Abstract: Aggregate signatures are a useful primitive which allows to aggregate into a single and constant-length signature many signatures on different messages computed by different users. Specific proposals of aggregate signature schemes exist only for PKI-based scenarios. For identity-based scenarios, where public keys of the users are directly derived from their identities, the signature schemes proposed up to now do not seem to allow constant-length aggregation.

We provide an intermediate solution to this problem, by designing a new identity-based signature scheme which allows aggregation when the signatures to be aggregated come all from the same signer. The new scheme is deterministic and enjoys some better properties than the previous proposals. We formally prove that the scheme is unforgeable, in the random oracle model, assuming that the Computational co-Diffie-Hellman problem is hard to solve.

Category / Keywords: public-key cryptography / identity-based signatures, aggregation of signatures, provable security, random oracle model

Publication Info: The Computer Journal, Volume 49, Number 3, pp. 322-330, 2006

Date: received 6 Sep 2005, last revised 24 Nov 2010

Contact author: jherranz at ma4 upc edu

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Version: 20101124:114635 (All versions of this report)

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