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The Cryptographic Complexity of Anonymous Coins: A Systematic Exploration

School of Computer Science, Queensland University of Technology, Brisbane City, QLD 4000, Australia
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Received: 31 December 2020 / Revised: 4 February 2021 / Accepted: 18 February 2021 / Published: 4 March 2021
The modern financial world has seen a significant rise in the use of cryptocurrencies in recent years, partly due to the convincing lure of anonymity promised by these schemes. Bitcoin, despite being considered as the most widespread among all, is claimed to have significant lapses in relation to its anonymity. Unfortunately, studies have shown that many cryptocurrency transactions can be traced back to their corresponding participants through the analysis of publicly available data, to which the cryptographic community has responded by proposing new constructions with improved anonymity claims. Nevertheless, the absence of a common metric for evaluating the level of anonymity achieved by these schemes has led to numerous disparate ad hoc anonymity definitions, making comparisons difficult. The multitude of these notions also hints at the surprising complexity of the overall anonymity landscape. In this study, we introduce such a common framework to evaluate the nature and extent of anonymity in (crypto) currencies and distributed transaction systems, thereby enabling one to make meaningful comparisons irrespective of their implementation. Accordingly, our work lays the foundation for formalizing security models and terminology across a wide range of anonymity notions referenced in the literature, while showing how “anonymity” itself is a surprisingly nuanced concept, as opposed to existing claims that are drawn upon at a higher level, thus missing out on the elemental factors underpinning anonymity. View Full-Text
Keywords: anonymity; security models; cryptocurrencies; anonymous coins; foundations anonymity; security models; cryptocurrencies; anonymous coins; foundations
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MDPI and ACS Style

Amarasinghe, N.; Boyen, X.; McKague, M. The Cryptographic Complexity of Anonymous Coins: A Systematic Exploration. Cryptography 2021, 5, 10. https://0-doi-org.brum.beds.ac.uk/10.3390/cryptography5010010

AMA Style

Amarasinghe N, Boyen X, McKague M. The Cryptographic Complexity of Anonymous Coins: A Systematic Exploration. Cryptography. 2021; 5(1):10. https://0-doi-org.brum.beds.ac.uk/10.3390/cryptography5010010

Chicago/Turabian Style

Amarasinghe, Niluka, Xavier Boyen, and Matthew McKague. 2021. "The Cryptographic Complexity of Anonymous Coins: A Systematic Exploration" Cryptography 5, no. 1: 10. https://0-doi-org.brum.beds.ac.uk/10.3390/cryptography5010010

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