Paper 2016/163 Original: eprint.iacr.org/2016/163 ↗
ZKBoo: Faster Zero-Knowledge for Boolean Circuits
Abstract
In this paper we describe ZKBoo, a proposal for practically efficient zero-knowledge arguments especially tailored for Boolean circuits and report on a proof-of-concept implementation. As an highlight, we can generate (resp. verify) a non-interactive proof for the SHA-1 circuit in approximately 13ms (resp. 5ms), with a proof size of 444KB. Our techniques are based on the “MPC-in-the-head” approach to zero-knowledge of Ishai et al. (IKOS), which has been successfully used to achieve significant asymptotic improvements. Our contributions include: 1) A thorough analysis of the different variants of IKOS, which highlights their pro and cons for practically relevant soundness parameters; 2) A generalization and simplification of their approach, which leads to faster Sigma-protocols (that can be made non-interactive using the Fiat-Shamir heuristic) for statements of the form “I know x such that y = f(x)” (where f is a circuit and y a public value); 3) A case study, where we provide explicit protocols, implementations and benchmarking of zero-knowledge protocols for the SHA-1 and SHA-256 circuits;
Metadata
- Available format(s)
PDF- Category
- Implementation
- Publication info
- Preprint.
- History
- 2016-08-12: last updated
- 2016-02-18: published
- Short URL
- https://ia.cr/2016/163
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2016/163,
author = {Irene Giacomelli and Jesper Madsen and Claudio Orlandi},
title = {ZKBoo: Faster Zero-Knowledge for Boolean Circuits},
howpublished = {Cryptology {ePrint} Archive, Paper 2016/163},
year = {2016},
url = {https://eprint.iacr.org/2016/163}
}