More short signatures without random oracles

Victor K.  Wei; Tsz Hon Yuen

Paper 2005/463

More short signatures without random oracles

Victor K. Wei and Tsz Hon Yuen

Abstract

We construct three new signatures and prove their securities without random oracles. They are motivated, respectively, by Boneh and Boyen's, Zhang, et al.'s, and Camenisch and Lysyanskaya's signatures without random oracles. The first two of our signatures are as short as Boneh and Boyen's (resp. Zhang, et al.'s} state-of-the-art short signatures. Our third signature is reducible to a modified LRSW Assumption but without their hypothesized external signing oracle. New and interesting variants of the q-SDH Assumption, the q-SR (Square Root) Assumption are also presented. New and independently interesting proof techniques extending the two-mode technique of Boneh and Boyen are used, including a combined three-mode simulation and rewinding in the standard model.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Accepted by International Journal of Network Security, ISSN 1816-353X (Print) , ISSN 1816-3548 (Online) http://isrc.nchu.edu.tw/ijns/
Keywords: signature
Contact author(s): kwwei @ ie cuhk edu hk
History: 2006-02-12: last of 9 revisions; 2005-12-31: received; See all versions
Short URL: https://ia.cr/2005/463
License: CC BY

BibTeX

@misc{cryptoeprint:2005/463,
      author = {Victor K.  Wei and Tsz Hon Yuen},
      title = {More short signatures without random oracles},
      howpublished = {Cryptology {ePrint} Archive, Paper 2005/463},
      year = {2005},
      url = {https://eprint.iacr.org/2005/463}
}