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Quantum attacks on Bitcoin, and how to protect against them

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  • Divesh Aggarwal
  • Gavin K. Brennen
  • Troy Lee
  • Miklos Santha
  • Marco Tomamichel

Abstract

The key cryptographic protocols used to secure the internet and financial transactions of today are all susceptible to attack by the development of a sufficiently large quantum computer. One particular area at risk are cryptocurrencies, a market currently worth over 150 billion USD. We investigate the risk of Bitcoin, and other cryptocurrencies, to attacks by quantum computers. We find that the proof-of-work used by Bitcoin is relatively resistant to substantial speedup by quantum computers in the next 10 years, mainly because specialized ASIC miners are extremely fast compared to the estimated clock speed of near-term quantum computers. On the other hand, the elliptic curve signature scheme used by Bitcoin is much more at risk, and could be completely broken by a quantum computer as early as 2027, by the most optimistic estimates. We analyze an alternative proof-of-work called Momentum, based on finding collisions in a hash function, that is even more resistant to speedup by a quantum computer. We also review the available post-quantum signature schemes to see which one would best meet the security and efficiency requirements of blockchain applications.

Suggested Citation

  • Divesh Aggarwal & Gavin K. Brennen & Troy Lee & Miklos Santha & Marco Tomamichel, 2017. "Quantum attacks on Bitcoin, and how to protect against them," Papers 1710.10377, arXiv.org.
    • Handle: RePEc:arx:papers:1710.10377
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    Cited by:

    1. Pernice, Ingolf G. A. & Scott, Brett, 2021. "Cryptocurrency," Internet Policy Review: Journal on Internet Regulation, Alexander von Humboldt Institute for Internet and Society (HIIG), Berlin, vol. 10(2), pages 1-10.
    2. Peter P. Rohde & Vijay Mohan & Sinclair Davidson & Chris Berg & Darcy Allen & Gavin K. Brennen & Jason Potts, 2021. "Quantum crypto-economics: Blockchain prediction markets for the evolution of quantum technology," Papers 2102.00659, arXiv.org.

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