Cryptography researchers have slashed their estimate of the quantum computing resources needed to break the encryption underpinning Bitcoin and Ethereum, according to a new paper shared with CoinDesk, cutting the previous benchmark roughly in half.
A Faster Path to Cracking Crypto's Defenses
The findings center on an improvement to a core calculation used within Shor's algorithm, the quantum method theoretically capable of unraveling the elliptic-curve cryptography that secures blockchain wallets. By refining that calculation, the researchers reduced the number of quantum operations a machine would need to threaten these systems.
The work reportedly outpaced results published by Google in March, which had set an earlier marker for how efficiently a quantum computer might target such encryption. What makes the latest research notable is the collaboration behind it: human researchers working alongside AI agents jointly produced the optimized approach.
Every improvement to the math quietly moves crypto's quantum doomsday clock a little closer to midnight.
Recalculating Crypto's Quantum Clock
For years, the crypto industry has treated a quantum attack as a distant, theoretical concern. Estimates for when a sufficiently powerful quantum computer could break Bitcoin's cryptography have varied widely, and each new efficiency gain reshapes those projections. Halving the resource estimate does not mean the threat is imminent, but it does narrow the margin of safety that developers and holders have long assumed.
The research adds another variable to an already uncertain timeline. Progress in quantum computing depends not only on raw hardware advances but also on algorithmic breakthroughs that lower the bar for what that hardware must accomplish. This paper falls squarely into the second category.
Several factors continue to shape the outlook:
- Advances in quantum hardware capable of maintaining stable qubits at scale
- Algorithmic refinements that reduce the operations required for an attack
- The pace at which blockchains adopt quantum-resistant cryptography
The takeaway for the crypto community is that the quantum question remains a moving target. As researchers and AI tools keep chipping away at the theoretical requirements, the pressure grows on major networks to consider post-quantum defenses well before any real-world machine can put the math to the test.