Paper 2020/1565 Original: eprint.iacr.org/2020/1565 ↗
Achieving privacy and accountability in traceable digital currency
Abstract
Several Central Bank Digital Currency (CBDC) projects are considering the development of a digital currency that is managed on a permissioned blockchain, i.e. only authorized entities are involved in transactions verification. In this paper, we explore the best possible balance between privacy and accountability in such a traceable digital currency. Indeed, in case of suspicion of fraud or money laundering activity, it is important to enable the retrieval of the identity of a payer or a payee involved in a specific transaction. Based on a preliminary analysis of achievable anonymity properties in a transferable, divisible and traceable digital currency systems, we first present a digital currency framework along with the corresponding security and privacy model. Then, we propose a pairing-free traceable digital currency system that reconciles user's privacy protection and accountability. Our system is proven secure in the random oracle model.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2020-12-17: last updated
- 2020-12-17: published
- Short URL
- https://ia.cr/2020/1565
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2020/1565,
author = {Amira Barki and Aline Gouget},
title = {Achieving privacy and accountability in traceable digital currency},
howpublished = {Cryptology {ePrint} Archive, Paper 2020/1565},
year = {2020},
url = {https://eprint.iacr.org/2020/1565}
}