Crowd Verifiable Zero-Knowledge and End-to-End Verifiable Multiparty Computation

Baldimtsi, F., Kiayias, A., Zacharias, T. and Zhang, B. (2020) Crowd Verifiable Zero-Knowledge and End-to-End Verifiable Multiparty Computation. In: Advances in Cryptology – ASIACRYPT 2020. 26th International Conference on the Theory and Application of Cryptology and Information Security, Daejeon, South Korea, 7-11 Dec 2020, pp. 717-748. ISBN 9783030648404 (doi: 10.1007/978-3-030-64840-4_24)

Abstract

Auditing a secure multiparty computation (MPC) protocol entails the validation of the protocol transcript by a third party that is otherwise untrusted. In this work, we introduce the concept of end-to-end verifiable MPC (VMPC), that requires the validation to provide a correctness guarantee even in the setting that all servers, trusted setup primitives and all the client systems utilized by the input-providing users of the MPC protocol are subverted by an adversary. To instantiate VMPC, we introduce a new concept in the setting of zero-knowlegde protocols that we term crowd verifiable zero-knowledge (CVZK). A CVZK protocol enables a prover to convince a set of verifiers about a certain statement, even though each one individually contributes a small amount of entropy for verification and some of them are adversarially controlled. Given CVZK, we present a VMPC protocol that is based on discrete-logarithm related assumptions. At the high level of adversity that VMPC is meant to withstand, it is infeasible to ensure perfect correctness, thus we investigate the classes of functions and verifiability relations that are feasible in our framework, and present a number of possible applications the underlying functions of which can be implemented via VMPC.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Zacharias, Dr Thomas
• Authors: Baldimtsi, F., Kiayias, A., Zacharias, T., and Zhang, B.
• College/School: College of Science and Engineering > School of Computing Science
• Journal Name: Advances in Cryptology – ASIACRYPT 2020
• Publisher: Springer International Publishing
• ISSN: 1611-3349
• ISBN: 9783030648404