Sequential Aggregate Signatures Made Shorter
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 et al. 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).
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- 1.Ahn, J.H., Green, M., Hohenberger, S.: Synchronized aggregate signatures: new definitions, constructions and applications. In: ACM Conference on Computer and Communications Security, pp. 473–484 (2010)Google Scholar
- 4.Boldyreva, A., Gentry, C., O’Neill, A., Yum, D.H.: Ordered multisignatures and identity-based sequential aggregate signatures, with applications to secure routing. Cryptology ePrint Archive, Report 2007/438 (2010), http://eprint.iacr.org/2007/438
- 12.Itakura, K., Nakamura, K.: A public-key cryptosystem suitable for digital multisignatures. NEC Research & Development (71), 1–8 (1983)Google Scholar
- 13.Lee, K., Lee, D.H., Yung, M.: Aggregating cl-signatures revisited: Extended functionality and better efficiency. Cryptology ePrint Archive, Report 2012/562 (2012), http://eprint.iacr.org/2012/562
- 14.Lee, K., Lee, D.H., Yung, M.: Sequential aggregate signatures made shorter. Cryptology ePrint Archive (2013), http://eprint.iacr.org/
- 19.Micali, S., Ohta, K., Reyzin, L.: Accountable-subgroup multisignatures: extended abstract. In: Reiter, M.K., Samarati, P. (eds.) ACM Conference on Computer and Communications Security, pp. 245–254. ACM (2001)Google Scholar