Post Quantum Cryptography

European financial authorities say advanced quantum computers could eventually undermine cryptography used to secure blockchains, raising fresh concerns for Bitcoin holders using older or reused addresses. About 6.9 million Bitcoin, valued at roughly $586 billion, could be at risk if exposed public keys become vulnerable to future private key attacks.

Blockchains face a long-range security challenge as sophisticated actors collect encrypted data that could be decoded once quantum computing matures. Muriel Médard argues that post-quantum resilience can be built with classical coding techniques, including Random Linear Network Coding, rather than exotic hardware.

Bitcoin and Ethereum are moving post-quantum planning into sharper focus as U.S. support for quantum hardware expands. Developers are not treating the threat as immediate, but migration timelines are increasingly clustering around a 2029 planning horizon.

The Ethereum Foundation has set a December 2029 target to make Ethereum resistant to quantum-computing attacks across transactions, validators and data storage. The 2027 Hegotá upgrade is positioned as a scheduling anchor for later post-quantum cryptography work rather than the upgrade that delivers quantum resistance itself.

Monad developers have introduced an early proposal to separate wallet addresses from the credentials that control them. The design could let users recover lost keys, adopt passkeys, add multiple signers and move toward quantum-resistant account security without changing addresses.

Solana Foundation CISO Michael Coates says crypto’s next major security challenge is shifting from code exploits toward AI-powered social engineering, fake identities and compromised credentials. The foundation is also evaluating post-quantum cryptography as blockchain networks prepare for longer-term risks from quantum computing.

Hong Kong’s banking sector received a Quantum Preparedness Index score of 2.3 out of 10 from the Hong Kong Monetary Authority. The regulator is pushing banks toward stronger post-quantum cryptography planning, pilots and practical preparedness by 2030.

Quantum computing is moving from distant theory toward a practical risk for encrypted systems, and Bitcoin may be among the first major networks tested. Market experts say the largest challenge may not be cryptography itself, but whether decentralized governance can move quickly enough to deploy post-quantum protections.

The White House has issued twin executive orders to accelerate U.S. quantum computing efforts while preparing federal systems for a future where today’s encryption may no longer be safe. One directive pushes advanced hardware and sensors, while the other forces a shift to post-quantum cryptography.

The Algorand Foundation has unveiled a plan to harden its network against future quantum threats, with user-facing upgrades slated to begin in 2026. The roadmap reflects a broader industry push to prepare blockchain infrastructure for post-quantum cryptography.