- Ethlabs proposed a 2027 post-quantum target for Ethereum; the plan remains unapproved.
- Post-quantum transactions may cost more and initially reduce Ethereum’s capacity.
- Full capacity would require signature aggregation and post-quantum data availability.
Ethlabs has proposed moving Ethereum’s post-quantum readiness target to 2027, arguing that advances in artificial intelligence are increasing uncertainty around cryptographic risks.
The proposal would prioritize security changes in upcoming protocol work, including the Hegotá hard fork, but it has not been approved. Ethlabs said the plan would involve trade-offs in transaction costs, network capacity, account migration, and consensus design.
AI Adds Urgency to the Proposed Timeline
In a blog post, Ethlabs said AI could accelerate both the discovery of software vulnerabilities and research into mathematical problems relevant to cryptography. It cited the U.S. government’s move to shift its quantum-risk goal from 2035 to 2030 and Google’s post-quantum target of 2029.
The Ethereum Foundation had previously set December 2029 as the target for full post-quantum readiness, then moved it to 2028, according to Ethlabs.
The group called its proposed goal “pqai27,” combining post-quantum security with what it described as plausible post-AI readiness. That would mean using cryptography based on fewer assumptions and protecting clients against vulnerabilities found at scale, including through formal verification and Ethereum’s client diversity.
Ethlabs said reaching the target would require reassessing planned hard-fork features. It plans to withdraw its support for quick slots in Hegotá and focus its resources on the proposed security work. It said it still intends to work toward quick slots in 2028.
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Security Could Initially Mean Lower Capacity
Ethlabs described two stages. “Pqai-ready” would give consensus a post-quantum design and provide each user with a route to a post-quantum account. In that stage, Ethereum could continue operating at the capacity enabled by Glamsterdam, but possibly at reduced capacity if the network needed to switch to post-quantum transactions.
Those transactions would take up more space and cost more to include, according to the proposal. Rollups could use their calldata as a fallback while post-quantum data availability is developed. Ethlabs said current blob throughput could fit into regular blocks, but at higher inclusion cost.
The second stage, “pqai-scaled,” would aim to support post-quantum transactions and blobs at full capacity. The proposal identifies signature aggregation and post-quantum data availability as requirements for that goal.
In addition, Ethlabs said developers still need to assess whether to adapt Ethereum’s current Gasper consensus protocol or move toward decoupled consensus. The group also called for wallet tools and support to help users migrate accounts to post-quantum keys. It said validators would need migration support, while client teams would need time and resources to harden their software.
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Related: Ethereum Foundation Launches PQ Hub and Quantum Security Plan
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