Ethereum Prepares for Quantum Threats with Post-Quantum Program

Ethereum's post-quantum program has been established to address potential vulnerabilities in its core infrastructure.

The network is currently not at risk from quantum computers, but a sufficiently powerful machine could potentially break its cryptography.

Ethereum relies on various cryptographic systems, including ECDSA for user accounts and BLS signatures for validator consensus, which could be compromised by Shor's algorithm running on a powerful quantum computer.

The team has been working to develop leanXMSS, a hash-based signature scheme that can replace BLS signatures, but it comes with its own set of challenges, such as larger signature sizes.