Privacy Preservation in Permissionless Blockchain: A Survey

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openAccess
Journal Title
Journal ISSN
Volume Title
A2 Katsausartikkeli tieteellisessä aikakauslehdessä
Date
2021-08
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
295-307
Series
Digital Communications and Networks, Volume 7, issue 3
Abstract
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.
Description
Keywords
Anonymity, Blockchain, Cryptocurrency, Privacy
Other note
Citation
Peng, L, Feng, W, Yan, Z, Li, Y, Zhou, X & Shimizu, S 2021, ' Privacy Preservation in Permissionless Blockchain: A Survey ', Digital Communications and Networks, vol. 7, no. 3, pp. 295-307 . https://doi.org/10.1016/j.dcan.2020.05.008