Blind signatures from Zero-knowledge arguments

Paulo L. Barreto; Gustavo H. M. Zanon

Paper 2023/067

Blind signatures from Zero-knowledge arguments

Paulo L. Barreto

, University of Washington Tacoma

Gustavo H. M. Zanon

, Universidade de São Paulo

Abstract

We propose a novel methodology to obtain $B$lind signatures that is fundamentally based on the idea of hiding part of the underlying plain signatures under a $Z$ero-knowledge argument of knowledge of the whole signature (hence the shorthand, $BZ$). Our proposal is necessarily non-black-box and stated in the random oracle model. We illustrate the technique by describing two instantiations: a classical setting based on the traditional discrete logarithm assumption, and a post-quantum setting based on the commutative supersingular isogeny Diffie-Hellman (CSIDH) assumption.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint.
Keywords: Blind signatures Zero-knowledge arguments
Contact author(s): pbarreto @ uw edu
ghmzanon @ gmail com
History: 2023-01-23: last of 2 revisions; 2023-01-20: received; See all versions
Short URL: https://ia.cr/2023/067
License: CC BY

BibTeX

@misc{cryptoeprint:2023/067,
      author = {Paulo L. Barreto and Gustavo H. M. Zanon},
      title = {Blind signatures from Zero-knowledge arguments},
      howpublished = {Cryptology ePrint Archive, Paper 2023/067},
      year = {2023},
      note = {\url{https://eprint.iacr.org/2023/067}},
      url = {https://eprint.iacr.org/2023/067}
}