EU Watchdogs Warn Quantum Computers Could Threaten Crypto Security
EU Regulators Issue Quantum Computing Warning
European Union financial supervisors warned that advances in quantum computing could threaten the cryptography securing blockchains and cryptocurrencies. The European Banking Authority, European Insurance and Occupational Pensions Authority, and European Securities and Markets Authority issued a joint risk update flagging quantum computing as a potential threat to systems used to secure transactions, communications, and databases.
Google Research Lowered Attack Estimates
The warning follows a more detailed assessment from Google Quantum AI. In March 2026, researchers estimated that breaking the cryptography used by many cryptocurrencies could require about 20 times fewer physical qubits than earlier estimates. A qubit is the basic unit of a quantum computer. The supervisors noted that no computer capable of carrying out such an attack exists today.
What This Means for Crypto Holders
For cryptocurrency holders, the concern is that a future quantum computer could derive a private key from an exposed public key and use it to authorize transactions. A private key is a secret code that allows someone to spend their cryptocurrency.
Blockchain Developers Respond
Bitcoin developer Jameson Lopp and five co-developers proposed a migration plan in February 2026. The proposal would phase out the network's current signatures and restrict how unmigrated funds could be spent five years after activation. The proposal has not been adopted.
The Ethereum Foundation aims to make Ethereum resistant to quantum attacks across its execution, consensus, and data layers by December 2029.
What Is Confirmed
- EU financial supervisors warned about quantum computing threats to blockchain security
- Google researchers said breaking crypto cryptography could require 20 times fewer qubits than previously thought
- No quantum computer capable of such attacks exists today
- Bitcoin developers proposed a migration plan in February that has not been adopted
- Ethereum Foundation targets December 2029 for quantum resistance
Why It Matters
If quantum computers become powerful enough to break current cryptographic signatures, they could potentially access cryptocurrency funds by deriving private keys from public keys. This represents a long-term security concern for the entire cryptocurrency ecosystem, though experts emphasize no such computer exists yet.
Sources
Newisty Editorial Team covers technology, cryptocurrency, digital products, online platforms, developer tools and the wider digital economy. Our content is researched from official sources, company announcements, public documentation, market data and other primary or reputable sources. Articles are reviewed and edited before publication for clarity, accuracy and useful context.