Ethereum Prepares Quantum-Resistant Accounts with Cost-Effective Solution

Ethereum developers are exploring ways to protect accounts from future quantum-computing threats without waiting for a costly network upgrade. According to Ethereum Foundation researcher Nicolas Consigny, the “Kohaku” project lead, Ethereum could begin adding post-quantum protections at an estimated cost of as little as $0.07 per action.

This approach leverages a new on-EVM method rather than a hard fork, which is a significant step forward in making quantum-resistant accounts more accessible and affordable. Consigny's proposal adapts SPHINCS+, a post-quantum signature scheme standardized by the U.S. National Institute of Standards and Technology (NIST), to reduce onchain verification costs.

The motivation behind this research is long-term quantum risk to Ethereum’s current reliance on elliptic-curve cryptography for signatures. Consigny's proposal, SPHINCS-, aims to bridge the gap between current solutions and more optimized designs like leanSPHINCS, which targets even lower verification costs through signature aggregation.