An Efficient NIZK Scheme for Privacy-Preserving Transactions over Account-Model Blockchain

Shunli Ma; Yi Deng; Debiao He; Jiang Zhang; Xiang Xie

Paper 2017/1239

An Efficient NIZK Scheme for Privacy-Preserving Transactions over Account-Model Blockchain

Shunli Ma, Yi Deng, Debiao He, Jiang Zhang, and Xiang Xie

Abstract

We introduce the abstract framework of decentralized smart contracts system with balance and transaction amount hiding property under the ACCOUNT architecture. To build a concrete system with such properties, we utilize a homomorphic public key encryption scheme and construct a highly efficient non-interactive zero knowledge (NIZK) argument based upon the encryption scheme to ensure the validity of the transactions. Our NIZK scheme is perfect zero knowledge in the common reference string model, while its soundness holds in the random oracle model. Compared to previous similar constructions, our proposed NIZK argument dramatically improves the time efficiency in generating a proof, at the cost of relatively longer proof size.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Minor revision. IEEE-TDSC
DOI: 10.1109/TDSC.2020.2969418
Keywords: Non-interactive zero knowledge decentralized smart contracts Account model
Contact author(s): mashunli @ iie ac cn
History: 2020-09-04: last of 3 revisions; 2017-12-23: received; See all versions
Short URL: https://ia.cr/2017/1239
License: CC BY

BibTeX

@misc{cryptoeprint:2017/1239,
      author = {Shunli Ma and Yi Deng and Debiao He and Jiang Zhang and Xiang Xie},
      title = {An Efficient {NIZK} Scheme for Privacy-Preserving Transactions over Account-Model Blockchain},
      howpublished = {Cryptology {ePrint} Archive, Paper 2017/1239},
      year = {2017},
      doi = {10.1109/TDSC.2020.2969418},
      url = {https://eprint.iacr.org/2017/1239}
}