Ethereum Foundation Swaps Poseidon for SHA/BLAKE in Quantum Plan
Ethereum Foundation abandons Poseidon hashing in post-quantum systems, researcher Justin Drake said, opting for established SHA/BLAKE after recent SNARK advances. Production-ready leanVM target 2027, with layer deployments in 2028 still preliminary. Eigen Labs' Sreeram Kannan says hash-based approaches have fewer known attack routes.
Quick Take
Ethereum Foundation drops Poseidon from post-quantum roadmap, favors SHA or BLAKE.
SNARK improvements make conventional hashes efficient enough, Justin Drake says.
Production-ready leanVM targeted for 2027; 2028 layer deployments preliminary.
Eigen Labs CEO notes hash-based systems face fewer known attack avenues.
Market Impact Analysis
NeutralTechnical roadmap change for Ethereum's post-quantum architecture; no immediate token or market implications.
Speculation Analysis
Key Takeaways
- Ethereum Foundation abandons Poseidon hash function in post-quantum plan, switching to established SHA or BLAKE.
- SNARK advances make conventional hashes efficient enough to replace Poseidon in leanVM, Justin Drake says.
- Production-ready leanVM targeted for 2027, with consensus, data, and execution layer deployments in 2028, though preliminary.
- Hash-based systems have fewer known attack avenues, Eigen Labs CEO notes, potentially speeding up deployment.
What Happened
Ethereum Foundation is moving away from the Poseidon hash function in its upcoming post-quantum architecture. Researcher Justin Drake announced the shift on Thursday, stating the foundation will use established alternatives like SHA or BLAKE instead. The decision affects planned systems such as leanVM, which aims to efficiently verify large volumes of blockchain activity. These systems are not yet on mainnet. The foundation cited advances in SNARKs—compact proofs that confirm computations without repeating underlying work—as making conventional hashes efficient enough for these use cases. The change signals a pragmatic pivot toward proven cryptographic primitives for Ethereum's long-term security.
The Numbers
The shift involves two primary hash functions: SHA and BLAKE, both widely deployed and audited. Production-ready leanVM is targeted for 2027, with deployments across Ethereum's consensus, data, and execution layers slated for 2028. These dates remain preliminary. Joint work with Eigen Labs and zero-knowledge proof firm Succinct has already increased proving speeds by 2.5 times. This performance boost supports the move to conventional hashes, reducing the need for specialized Poseidon-based designs.
Why It Happened
Researcher Justin Drake explained that recent SNARK improvements now allow standard hash functions to perform efficiently enough for planned post-quantum systems. Previously, Poseidon was optimized for SNARKs, but conventional hashes have caught up. Eigen Labs CEO Sreeram Kannan added that hash-based approaches have fewer known attack avenues compared to other post-quantum alternatives. These systems also benefit from years of real-world scrutiny, enabling faster deployment. The foundation's decision reflects a preference for battle-tested cryptography over newer, less proven constructs.
Broader Impact
Ethereum's move may influence other blockchain projects evaluating post-quantum strategies. By favoring widely adopted hash functions, the foundation reduces implementation risk and leverages existing security audits. The shift also highlights the rapid evolution of SNARK technology, which could make other specialized cryptographic primitives unnecessary. For Ethereum, the change aligns with its modular roadmap, ensuring quantum resistance without sacrificing performance.
What to Watch Next
- Monitor leanVM development progress and whether the 2027 target holds as SNARK technology continues to mature.
- Watch for official Ethereum Improvement Proposals (EIPs) detailing SHA/BLAKE integration into consensus, data, and execution layers.
- Track other post-quantum initiatives across the industry to see if they follow Ethereum's lead in adopting established hash functions.
This article is for informational purposes only and does not constitute financial advice.
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