Cryptology ePrint Archive: Report 2011/231

History-Free Sequential Aggregate Signatures

Marc Fischlin and Anja Lehmann and Dominique Schröder

Abstract: Aggregation schemes allow to combine several cryptographic values like message authentication codes or signatures into a shorter value such that, despite compression, some notion of unforgeability is preserved. Recently, Eikemeier et al. (SCN 2010) considered the notion of history-free sequential aggregation for message authentication codes, where the sequentially-executed aggregation algorithm does not need to receive the previous messages in the sequence as input. Here we discuss the idea for signatures where the new aggregate does not rely on the previous messages and public keys either, thus inhibiting the costly verifi cations in each aggregation step as in previous schemes by Lysyanskaya et al. (Eurocrypt 2004) and Neven (Eurocrypt 2008). Analogously to MACs we argue about new security de finitions for such schemes and compare them to previous notions for history-dependent schemes. We fi nally give a construction based on the BLS signature scheme which satisfi es our notion.

Category / Keywords: public-key cryptography / Aggregation, Signature, History-Freeness

Date: received 10 May 2011, last revised 14 Aug 2012

Contact author: marc fischlin at gmail com

Available format(s): PDF | BibTeX Citation

Note: A preliminary version appears in: Security and Cryptography for Networks (SCN) 2012, Lecture Notes in Computer Science, Vol.7485, pp.113-130, Springer-Verlag, 2012.

Version: 20120814:074604 (All versions of this report)

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