Ethereum and Solana face significant security risks in a future era of quantum computers, an analysis said. Quantum security group Project Eleven assessed that about 65 percent of Ethereum and virtually all of Solana are vulnerable to quantum attacks that could undermine public-key cryptography. It cited risks to Ethereum validator keys and Solana addresses that embed public keys. The Ethereum Foundation and Solana ecosystem developers are preparing post-quantum upgrades, with timelines extending into the next decade.

Ethereum is preparing to transition to post-quantum cryptography with a target of around 2029. It judges the threat is not immediate but cannot be ignored because advanced quantum computers could expose private keys and put billions of dollars at risk. A key issue is performance, as post-quantum schemes can increase signature sizes and verification costs. Ethereum is pursuing structural redesign, including SNARK-based aggregation, and prioritising cryptographic agility.