SmartZKCP: Towards Practical Data Exchange Marketplace Against Active Attacks

Xuanming Liu; Jiawen Zhang; Yinghao Wang; Xinpeng Yang; Xiaohu Yang

Paper 2024/941

SmartZKCP: Towards Practical Data Exchange Marketplace Against Active Attacks

Xuanming Liu, Zhejiang University

Jiawen Zhang, Zhejiang University

Yinghao Wang, Zhejiang University

Xinpeng Yang, Zhejiang University

Xiaohu Yang, Zhejiang University

Abstract

The trading of data is becoming increasingly important as it holds substantial value. A blockchain-based data marketplace can provide a secure and transparent platform for data exchange. To facilitate this, developing a fair data exchange protocol for digital goods has garnered considerable attention in recent decades. The Zero Knowledge Contingent Payment (ZKCP) protocol enables trustless fair exchanges with the aid of blockchain and zero-knowledge proofs. However, applying this protocol in a practical data marketplace is not trivial. In this paper, several potential attacks are identified when applying the ZKCP protocol in a practical public data marketplace. To address these issues, we propose SmartZKCP, an enhanced solution that offers improved security measures and increased performance. The protocol is formalized to ensure fairness and secure against potential attacks. Moreover, SmartZKCP offers efficiency optimizations and minimized communication costs. Evaluation results show that SmartZKCP is both practical and efficient, making it applicable in a data exchange marketplace.

Metadata

Available format(s): PDF
Category: Applications
Publication info: Published elsewhere. Blockchain: Research and Applications (BCRA 2024)
Keywords: fair exchange smart contracts zero-knowledge
Contact author(s): hinsliu @ zju edu cn
yangxh @ zju edu cn
History: 2024-09-12: revised; 2024-06-12: received; See all versions
Short URL: https://ia.cr/2024/941
License: CC BY

BibTeX

@misc{cryptoeprint:2024/941,
      author = {Xuanming Liu and Jiawen Zhang and Yinghao Wang and Xinpeng Yang and Xiaohu Yang},
      title = {{SmartZKCP}: Towards Practical Data Exchange Marketplace Against Active Attacks},
      howpublished = {Cryptology {ePrint} Archive, Paper 2024/941},
      year = {2024},
      url = {https://eprint.iacr.org/2024/941}
}