Will Ethereum Be Quantum Safe? This EF Lead Researcher Says Yes | Lean Ethereum

Ethereum is making significant strides in post-quantum cryptography, with a full migration planned for 2029. This initiative was catalyzed by Justin Drake's presentation at Defcon Bangkok in late 2024, prompting Ethereum to invest heavily in research and manpower while collaborating with external entities to address quantum threats.

The Lean Ethereum project, originally known as the Beam Chain project, aims to simplify Ethereum's consensus protocol and facilitate the transition to post-quantum cryptography. This transition will involve replacing current elliptic curve signature schemes with new post-quantum signature schemes, a priority for the Ethereum Foundation's researchers.

Currently, Ethereum relies on elliptic curve cryptography, which is vulnerable as quantum computing technology advances. Predictions indicate that a quantum computer capable of breaking this cryptography could emerge around 2030 or 2032, although the timeline remains uncertain. The decreasing resources required to compromise elliptic curve cryptography highlight the urgency for Ethereum to adapt.

The migration to a quantum-safe signature scheme will occur more gradually for Ethereum's execution layer compared to the consensus layer. Users will need to transition from the existing ECDSA signature scheme. Upcoming network upgrades, Glampsturdam and Hegotuff, are expected to be related to this migration, with significant changes anticipated one or two hard forks after Glampsturdam.

The Ethereum Foundation's post-quantum team, consisting of two members, is dedicated to researching and coding solutions for the consensus layer. They are developing a new signature scheme called XMSS, a post-quantum hash-based signature scheme, and are also working on a public key registry program as part of their quantum safety strategy. This transition is expected to enhance security and may enable privacy features like private transactions on Ethereum, despite potential trade-offs such as larger signature sizes and complexities in signature aggregation.

Toma Korgi asserts that Ethereum is on track to achieve full quantum safety before quantum computers pose a significant threat, with the complete migration planned for 2029. He notes that while the initial quantum computers will be expensive and primarily impact large orders, average users may not be immediately affected.

The Ethereum Foundation has made substantial investments in post-quantum research and implementation, collaborating with universities and external entities to bolster quantum safety. A recent breakthrough in binary field techniques has facilitated the use of standardized hash functions like Blake or Shah, which are essential for this transition.

Artificial intelligence plays a crucial role within the Ethereum Foundation, particularly in coding and formal verification tasks. The formal verification team is focused on ensuring that code executes as intended, while the foundation is also developing a project called EVM ISN, which automates coding into assembly language.

Research on post-quantum cryptography began at the end of 2024. Although the Poseidon hash function is not yet standardized by NIST, it is considered suitable for proof. The Ethereum Foundation is actively producing code in Rust for the new post-quantum consensus layer and is engaged in ongoing discussions with Bitcoin developers from Blockstream to align efforts in this critical area.