Cryptology ePrint Archive: Report 2006/096

Sequential Aggregate Signatures and Multisignatures without Random Oracles

Steve Lu and Rafail Ostrovsky and Amit Sahai and Hovav Shacham and Brent Waters

Abstract: We present the first aggregate signature, the first multisignature, and the first verifiably encrypted signature provably secure without random oracles. Our constructions derive from a novel application of a recent signature scheme due to Waters. Signatures in our aggregate signature scheme are sequentially constructed, but knowledge of the order in which messages were signed is not necessary for verification. The aggregate signatures obtained are shorter than Lysyanskaya et~al. sequential aggregates and can be verified more efficiently than Boneh et~al. aggregates. We also consider applications to secure routing and proxy signatures.

Category / Keywords: public-key cryptography / Aggregate Signatures

Publication Info: To appear in Eurocrypt 2006.

Date: received 10 Mar 2006

Contact author: bwaters at csl sri com

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Version: 20060312:063243 (All versions of this report)

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