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Title: A new blind ECDSA scheme for bitcoin transaction anonymity
Authors: Yi, Xun
Lam, Kwok-Yan
Keywords: Engineering::Computer science and engineering
Issue Date: 2019
Source: Yi, X., & Lam, K.-Y. (2019). A new blind ECDSA scheme for bitcoin transaction anonymity. Proceedings of the 2019 ACM Asia Conference on Computer and Communications Security (Asia CCS'19), 613-620. doi:10.1145/3321705.3329816
Abstract: In this paper, we consider a scenario where a bitcoin liquidity provider sells bitcoins to clients. When a client pays for a bitcoin online, the provider is able to link the client's payment information to the bitcoin sold to that client. To address the privacy concerns of clients, we require that the bitcoin provider cannot tell the relationship between the real identities of clients and the sold bitcoins in the blockchain. This requirement can be effectively achieved by using blind signatures. However, existing blind signature schemes are incompatible with the Elliptic Curve Digital Signature Algorithm (ECDSA) which is used by most of the existing bitcoin protocol, thus cannot be applied directly in Bitcoin. In this paper, we propose a new blind signature scheme that allows generating a blind signature compatible with the standard ECDSA. Afterwards, we make use of the new scheme to achieve bitcoin transaction anonymity. The new scheme is built on a variant of the Paillier cryptosystem and its homomorphic properties. As long as the modified Paillier cryptosystem is semantically secure, the new blind signature scheme has blindness and unforgeability.
ISBN: 9781450367523
DOI: 10.1145/3321705.3329816
Rights: © 2019 Association for Computing Machinery. All rights reserved. This paper was published in Proceedings of the 2019 ACM Asia Conference on Computer and Communications Security (Asia CCS'19) and is made available with permission of Association for Computing Machinery.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:RTP Conference Papers

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