文献类型：期刊文献

英文题名：Accio: Variable-Amount, Optimized-Unlinkable and NIZK-Free Off-Chain Payments via Hubs

作者：Ge, Zhonghui[1]; Gu, Jiayuan[1]; Wang, Chenke[1]; Long, Yu[1]; Xu, Xian[2]; Gu, Dawu[1]

机构：[1] Shanghai Jiao Tong University, Shanghai, China; [2] East China University of Science and Technology, Shanghai, China

年份：2023

起止页码：1541

外文期刊名：CCS 2023 - Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security

收录：EI(收录号：20235115243441)

语种：英文

外文关键词：Chromium compounds - Cryptography

摘要：Payment channel hubs (PCHs) serve as a promising solution to achieving quick off-chain payments between pairs of users. They work by using an untrusted tumbler to relay the payments between the payer and payee and enjoy the advantages of low cost and high scalability. However, the most recent privacy-preserving payment channel hub solution that supports variable payment amounts suffers from limited unlinkability, e.g., being vulnerable to the abort attack. Moreover, this solution utilizes zero-knowledge proofs, which bring huge costs on both computation time and communication overhead. Therefore, how to design PCHs that support variable amount payments and unlinkability, but reduce the use of huge-cost cryptographic tools as much as possible, is significant for the large-scale practical applications of off-chain payments. In this paper, we propose Accio, a variable amount payment channel hub solution with optimized unlinkability, by deepening research on unlinkability and constructing a new cryptographic tool. We provide the detailed Accio protocol and formally prove its security and privacy under the Universally Composable framework. Our prototype demonstrates its feasibility and the evaluation shows that Accio outperforms the other state-of-the-art works in both communication and computation costs. ? 2023 Copyright held by the owner/author(s). Publication rights licensed to ACM