- Google researchers say a quantum attack on Ethereum encryption needs 20x fewer resources than estimated.
- Attack on ECDLP-256 could execute in minutes using fewer than 500,000 physical qubits per research.
- Ethereum developers introduce SPHINCS minus, achieving quantum-resistant verification at 150K gas.
Google Quantum AI researchers Ryan Babbush and Hartmut Neven have recently published updated estimates showing the resources required to crack the cryptography protecting Ethereum and most blockchain wallets could be approximately 20 times lower than previously calculated.
The research focuses on elliptic curve cryptography, the system securing the vast majority of blockchain transactions and wallet addresses. Newly compiled quantum circuits suggest an attack on the ECDLP-256 problem could be executed in minutes using fewer than 500,000 physical qubits, a significant reduction from earlier estimates.
No quantum system capable of executing such an attack exists today. The margin for error is narrowing as quantum hardware advances, and the researchers explicitly urged cryptocurrency communities to begin migrating to post-quantum cryptography without delay.
The Ethereum Response
Developers in the Ethereum ecosystem are already moving. A new cryptographic framework called SPHINCS minus, published on the Ethereum research forum on June 12, demonstrates that quantum-resistant signature verification can be achieved directly on the Ethereum Virtual Machine at practical cost without requiring any protocol changes.
The implementation achieves verification at approximately 127,000 to 150,000 gas, depending on the parameter set chosen, using Ethereum’s existing KECCAK256 opcode as the underlying hash function. A formal proof of the verifier has been completed using Lean 4 with Verity, making it suitable for organizations seeking FIPS compliance on Ethereum.
The framework emerged from a discussion with Vitalik Buterin about post-quantum cryptography, with the core insight being that replacing the standard SHAKE256 hash function with Ethereum’s native KECCAK256 allows the entire verification process to run on-chain without any precompile or protocol modification.
The Broader Picture
Google has committed to migrating all its own security systems to post-quantum cryptography by 2029, part of an effort running since 2016. Early initiatives across Algorand, Solana, and the XRP Ledger are also exploring quantum-resistant approaches.
For the crypto industry, the combined message from Google’s warning and the SPHINCS minus research is consistent. Quantum resilience is no longer a theoretical future concern. It is an engineering problem that needs active work now, and solutions deployable on existing infrastructure are already available.
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