1. bookVolumen 2022 (2022): Edición 1 (January 2022)
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Revista
eISSN
2299-0984
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16 Apr 2015
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4 veces al año
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(∈, δ)-Indistinguishable Mixing for Cryptocurrencies

Publicado en línea: 20 Nov 2021
Volumen & Edición: Volumen 2022 (2022) - Edición 1 (January 2022)
Páginas: 49 - 74
Recibido: 31 May 2021
Aceptado: 16 Sep 2021
Detalles de la revista
License
Formato
Revista
eISSN
2299-0984
Primera edición
16 Apr 2015
Calendario de la edición
4 veces al año
Idiomas
Inglés
Abstract

We propose a new theoretical approach for building anonymous mixing mechanisms for cryptocurrencies. Rather than requiring a fully uniform permutation during mixing, we relax the requirement, insisting only that neighboring permutations are similarly likely. This is defined formally by borrowing from the definition of differential privacy. This relaxed privacy definition allows us to greatly reduce the amount of interaction and computation in the mixing protocol. Our construction achieves O(polylog(n)) computation time for mixing n addresses, whereas all other mixing schemes require O(n2) total computation across all parties. Additionally, we support a smooth tolerance of fail-stop adversaries and do not require any trusted setup. We analyze the security of our generic protocol under the UC framework, and under a stand-alone, game-based definition. We finally describe an instantiation using ring signatures and confidential transactions.

Keywords

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