Committing to quantum resistance: a slow defence for Bitcoin against a fast quantum computing attack.

Abstract:

:Quantum computers are expected to have a dramatic impact on numerous fields due to their anticipated ability to solve classes of mathematical problems much more efficiently than their classical counterparts. This particularly applies to domains involving integer factorization and discrete logarithms, such as public key cryptography. In this paper, we consider the threats a quantum-capable adversary could impose on Bitcoin, which currently uses the Elliptic Curve Digital Signature Algorithm (ECDSA) to sign transactions. We then propose a simple but slow commit-delay-reveal protocol, which allows users to securely move their funds from old (non-quantum-resistant) outputs to those adhering to a quantum-resistant digital signature scheme. The transition protocol functions even if ECDSA has already been compromised. While our scheme requires modifications to the Bitcoin protocol, these can be implemented as a soft fork.

journal_name

R Soc Open Sci

authors

Stewart I,Ilie D,Zamyatin A,Werner S,Torshizi MF,Knottenbelt WJ

doi

10.1098/rsos.180410

subject

Has Abstract

pub_date

2018-06-20 00:00:00

pages

180410

issue

6

issn

2054-5703

pii

rsos180410

journal_volume

5

pub_type

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