Ethereum Sets 2029 Deadline for Quantum‑Resistant Upgrade
Quantum‑resistance deadline set for 2029
The Ethereum Foundation announced that it will finish all work needed to protect the network against quantum‑computer attacks by December 2029. This target is chosen because some experts say a quantum machine capable of breaking today’s cryptography could appear around 2030.
Key milestones
- 2027 Hegotá hard fork will keep the schedule on track but will not yet add quantum‑resistant features.
- Five subsequent hard forks are planned, roughly every 7 months, to introduce new signature schemes, a public‑key registry and a fallback protection mode.
- Proposals include replacing the secp256k1 signature algorithm, adding hash‑based signatures (leanSPHINCS), and creating post‑quantum attestations for validators.
What the Foundation says
In a Monday blog post, the Protocol cluster called the December 2029 deadline “non‑negotiable” until a review in January 2027, when outside experts will evaluate the pace of quantum‑computing progress. The post also notes that companies such as Google, Cloudflare and Microsoft are aiming for similar migration windows.
Technical background
Current Ethereum security relies on the secp256k1 elliptic‑curve algorithm for both user transactions and validator signatures. If a powerful quantum computer could reverse the public key shown on‑chain, it could derive the private key and forge transactions.
Why the deadline matters
Preparing now reduces the risk that a future quantum breakthrough could compromise funds or disrupt the network. The planned fallback, called “minimum viable post‑quantum protection,” would keep Ethereum running with reduced guarantees if a quantum attack occurs before the full upgrade is finished.
Next steps
The Foundation will continue developing the cryptographic proposals and schedule the five post‑Hegotá hard forks. A reassessment of quantum‑computing progress is slated for January 2027.
