European Regulators Warn Quantum Computers Could Break Bitcoin And Ethereum ECDSA Security

European regulators have issued a formal warning that quantum computing poses an existential security threat to major cryptocurrencies, including Bitcoin and Ethereum. The warning, released by European financial oversight authorities, cautions that the cryptographic foundations underpinning these digital assets could be rendered obsolete by sufficiently powerful quantum machines. The statement emphasizes that the threat is not hypothetical but a matter of when, not if, with regulators urging stakeholders to take the risk seriously.

The core vulnerabilities identified in the warning center on the cryptographic algorithms that secure Bitcoin and Ethereum networks. Bitcoin relies on the Elliptic Curve Digital Signature Algorithm (ECDSA) for transaction signing, while Ethereum similarly depends on elliptic curve cryptography for its account security. Shor's algorithm, a quantum computing method, could potentially factor large numbers and compute discrete logarithms exponentially faster than classical computers, directly threatening ECDSA's security assumptions.

While the European regulators did not provide a specific date for when quantum computers could realistically break current cryptographic protections, the warning implies a timeline measured in years rather than decades. Industry estimates suggest that a quantum computer capable of breaking ECDSA would require thousands of stable qubits, a threshold that some experts believe could be reached within the next 10 to 20 years.

The regulators' warning includes recommendations for transitioning to quantum-resistant cryptographic algorithms. Post-quantum cryptography standards, such as those being developed by the National Institute of Standards and Technology (NIST), offer potential replacements for ECDSA and other vulnerable schemes. The advisory suggests that cryptocurrency networks should begin exploring lattice-based cryptography and other quantum-safe alternatives that have shown resilience against quantum attacks.