Privacy preservation in permissionless blockchain: A survey

Digital Communications and Networks

Xiaokang Zhou¹  Yafeng Li²  Wei Feng³  Zheng Yan³  Li Peng³  Shohei Shimizu⁴ 

[1] Corresponding author.;Department of Communications and Networking, Aalto University, Espoo, 02150, Finland;School of Cyber Engineering, Xidian University, Xi’an, 710071, China;The 20th Research Institute of China Electronics Technology Group Corporation, Xi’an, 710061, China;

关键词: Blockchain;    Privacy;    Cryptocurrency;    Anonymity;   

DOI  :  

来源: DOAJ

【 摘 要 】

Permissionless blockchain, as a kind of distributed ledger, has gained considerable attention because of its openness, transparency, decentralization, and immutability. Currently, permissionless blockchain has shown a good application prospect in many fields, from the initial cryptocurrency to the Internet of Things (IoT) and Vehicular Ad-Hoc Networking (VANET), which is considered as the beginning of rewriting our digital infrastructure. However, blockchain confronts some privacy risks that hinder its practical applications. Though numerous surveys reviewed the privacy preservation in blockchain, they failed to reveal the latest advances, nor have they been able to conduct a unified standard comprehensive classification of the privacy protection of permissionless blockchain. Therefore, in this paper, we analyze the specific characteristics of permissionless blockchain, summarize the potential privacy threats, and investigate the unique privacy requirements of blockchain. Existing privacy preservation technologies are carefully surveyed and evaluated based on our proposed evaluation criteria. We finally figure out open research issues as well as future research directions from the perspective of privacy issues.

【 授权许可】

Unknown