15-Bit ECC Key Broken on Quantum Hardware, Researcher Wins Q-Day Prize
thequantuminsider.com Apr 25, 2026

15-Bit ECC Key Broken on Quantum Hardware, Researcher Wins Q-Day Prize

AI-summarised brief · reviewed before publication

Giancarlo Lelli, an independent researcher, won the Q-Day Prize for breaking a 15-bit elliptic curve key on a publicly accessible quantum computer. This achievement extends prior public demonstrations and highlights ongoing reductions in resource estimates for larger-scale attacks on elliptic curve cryptography. The result underscores the need for migration to post-quantum cryptography, as it threatens Bitcoin, Ethereum, and over $2.5 trillion in ECC-secured digital assets.

💡 Why It Matters

  • · The window to secure digital assets from quantum attacks is rapidly closing, with Google committing to quantum-secure status by 2029.
  • · The practical demonstration of a 15-bit key break on quantum hardware raises concerns about the vulnerability of 6.9 million Bitcoin wallets and other blockchains using elliptic curve cryptography.