Ethereum co-founder Vitalik Buterin warned that AI-accelerated mathematical breakthroughs could undermine lattice-based cryptography and other schemes viewed as quantum-resistant within two years. In an October 8 post, Buterin challenged the assumption that certain cryptographic methods—including ML-DSA and fully homomorphic encryption—remain secure against emerging threats.
Buterin questioned whether undiscovered vulnerabilities in cryptographic systems might be exposed by AI-driven analysis. He noted that RSA keys and signatures currently require approximately 400 bytes rather than 64 bytes, suggesting similar hidden weaknesses could exist in elliptic curves and lattice-based methods.
Ethereum's Shift to Hash-Based Signatures
In response to these risks, Ethereum's roadmap has moved toward hash-based cryptographic signatures such as WOTS and SPHINCS, which Buterin said lack exploitable mathematical structure and are more resistant to AI-accelerated attacks. Hash-only approaches for signatures and proofs are already proven to work, though public key encryption presents greater challenges since mathematical theory indicates it cannot be built solely from hashes.
Recommended Security Measures
Buterin advised several defensive practices for minimizing AI-related cryptographic risks:
- Signers should change their keys after each operation in multisignature schemes
- Gather signatures off-chain when possible to minimize the window between signature exposure and key deactivation
- Use fresh addresses wherever practical
- Employ off-chain multisig confirmations
- Increase key parameters for any lattice-based public key encryption to mitigate long-term risks
The Ethereum Foundation is targeting full Layer-1 quantum resistance by 2029. Meanwhile, Europol has urged the crypto industry to prepare for quantum computing threats, identifying crypto wallets as primary exposure points. The European Union's NIS Cooperation Group has recommended adopting post-quantum strategies by the end of 2026.
