Stand-Alone and setup-free verifiably committed signatures

  • Authors:
  • Huafei Zhu;Feng Bao

  • Affiliations:
  • Department of Information Security, I2R, A-Star, Singapore;Department of Information Security, I2R, A-Star, Singapore

  • Venue:
  • CT-RSA'06 Proceedings of the 2006 The Cryptographers' Track at the RSA conference on Topics in Cryptology
  • Year:
  • 2006

Quantified Score

Hi-index 0.00

Visualization

Abstract

In this paper, a novel construction of stand-alone and setup-free verifiably committed signatures from RSA – an open problem advertised by Dodis and Reyzin in their speech [16] is presented. The methodology used in this paper is reminiscent of the concept of verifiably encrypted signatures introduced by Asokan et al [1, 2] . We suggest to encrypt only a random salt used to generate a virtual commitment that will be embedded into Cramer-Shoup’s signature scheme and to prove the validity of the signature with respect to this encrypted value. Our construction is provably secure assuming that the underlying Cramer-Shoup’s signature scheme is secure against adaptive chosen-message attack, and Paillier’s encryption is one-way. We thus provide an efficient solution to Dodis-Reyzin’s open problem.