Cryptology ePrint Archive: Report 2013/384

Sequential Aggregate Signatures Made Shorter

Kwangsu Lee and Dong Hoon Lee and Moti Yung

Abstract: Sequential aggregate signature (SAS) is a special type of public-key signature that allows a signer to add his signature into a previous aggregate signature in sequential order. In this case, since many public keys are used and many signatures are employed and compressed, it is important to reduce the sizes of signatures and public keys. Recently, Lee, Lee, and Yung (PKC 2013) proposed an efficient SAS scheme with short public keys and proved its security without random oracles under static assumptions.

In this paper, we propose an improved SAS scheme that has a shorter signature size compared with that of Lee et al.'s SAS scheme. Our SAS scheme is also secure without random oracles under static assumptions. To achieve the improvement, we devise a new public-key signature scheme that supports multi-users and public re-randomization. Compared with the SAS scheme of Lee et al., our SAS scheme employs new techniques which allow us to reduce the size of signatures by increasing the size of the public keys (obviously, since signature compression is at the heart of aggregate signature this is a further step in understanding the aggregation capability of such schemes).

Category / Keywords: public-key cryptography / Public-key signature, Aggregate signature, Sequential aggregation, Multi-signature, Bilinear map

Publication Info: This is the full version of the ACNS 2013 paper.

Date: received 12 Jun 2013

Contact author: guspin at korea ac kr

Available format(s): PDF | BibTeX Citation

Version: 20130617:144403 (All versions of this report)

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