Rafail Ostrovsky - Publications

Sequential Aggregate Signatures and Multisignatures Without Random Oracles

Steve Lu, Rafail Ostrovsky, Amit Sahai, 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.

comment: Preliminary version in Proceedings of The 25th International Cryptology Conference, (EUROCRYPT-2006) Springer-Verlag/IACR Lecture Notes in Computer Science.

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