Aztec plans to complete a full migration to post-quantum cryptography by the end of 2030, setting a multi-year timeline to replace cryptographic components that could become vulnerable to sufficiently advanced quantum computers.
The privacy-focused blockchain outlined the roadmap in a technical paper published by co-founder Zac Williamson and Mike Connor. Williamson also announced the target in an October 15 post on X, saying the network had been designed with quantum resistance in mind but still required changes to achieve full post-quantum security.
The roadmap sets an initial February 2027 deadline for hardened software libraries and developer tools designed to protect private data against so-called harvest-now, decrypt-later attacks. Aztec also plans to select its post-quantum signature, encryption and proving systems during 2027 before undertaking the broader migration.
The changes will extend beyond transaction signatures to account authentication, key derivation, validator signatures, zero-knowledge proofs and Ethereum settlement infrastructure. The project said the transition will depend partly on cryptographic developments and upgrades to Ethereum.
Aztec prioritizes private data protection before full migration
Aztec said its existing architecture already provides protections against certain harvest-now, decrypt-later attacks, in which an adversary collects encrypted information today with the intention of decrypting it once sufficiently powerful quantum computers become available.
The network uses hashed public keys in several parts of its protocol to limit the information exposed to potential attackers. Its design also allows smart contract developers to choose how private information is delivered and which encryption methods are used.
However, Aztec acknowledged that these measures do not make the entire network quantum-proof. Its current proving system, account authentication mechanisms, and other cryptographic components still require changes.
The February 2027 milestone will focus on improving developer libraries and providing standard methods for handling private data. The goal is to reduce the risk of applications introducing vulnerabilities through their own encryption and message-delivery implementations.
Cryptographic upgrades scheduled for 2027
Aztec has outlined three selection milestones for the cryptographic systems required in its post-quantum architecture. The project plans to select a post-quantum digital signature scheme by March 2027, followed by a public-key encryption scheme by July. A post-quantum proving system is scheduled for selection by November 2027.
These components serve different functions within the network. Digital signatures authenticate transactions and participants, encryption protects private information, and proving systems allow users to demonstrate that transactions follow protocol rules without revealing their underlying data.
The proving-system transition presents a particular challenge because Aztec requires users to generate zero-knowledge proofs on devices such as phones and web browsers. The replacement must also support recursive proofs, keep proof sizes manageable, and maintain affordable verification costs.
Aztec currently uses CHONK, an elliptic-curve and pairing-based proving system designed for private smart contracts. The project is evaluating alternatives, including hash-based and lattice-based approaches, but has not selected a replacement.
The network also expects to reconsider its use of the Poseidon2 hash function as part of the longer-term migration, with Blake2s and Blake3 among the potential alternatives discussed in its technical paper.
Ethereum upgrades form part of the migration
Aztec’s transition will also depend on changes to Ethereum because the privacy network uses Ethereum for settlement and data availability. The technical roadmap identifies several areas requiring attention, including data availability commitments, verification primitives, public keys, and digital signatures.
In particular, Aztec said its migration must account for alternatives to Ethereum’s existing BLS12-381 KZG commitments and the cryptographic mechanisms used for account authentication and validator operations.
The dependency means Aztec cannot complete every part of its post-quantum transition independently. Its developers will need to coordinate their changes with Ethereum’s broader cryptographic upgrades.
Other blockchain networks advance post-quantum security work
Other blockchain networks are also testing or developing post-quantum security measures. TRON launched post-quantum signature support on its Nile testnet, allowing developers to test FN-DSA-512 and ML-DSA-44 algorithms. Founder Justin Sun said on October 10 that the feature could be deployed on mainnet when needed, although no launch date has been announced.
The Cosmos ecosystem introduced native support for ML-DSA signatures through its Ledger Security 2026.1 release. The update allows Cosmos-based networks to configure post-quantum keys for user accounts and validator consensus, with existing networks able to migrate validators gradually.
Ethereum’s Protocol cluster has separately set December 2029 as a target for making its Layer 1 resistant to quantum attacks across execution, consensus, and data layers. The target is part of its longer-term protocol roadmap and is scheduled for reassessment in January 2027.
Meanwhile, Shielded Labs launched Epoch on October 1, a research and engineering project focused on developing post-quantum cryptography and expanding formal verification for the Zcash protocol. The initiative is intended to replace cryptographic components considered vulnerable to future quantum attacks and complement other post-quantum work in the Zcash ecosystem.
Aztec cites implementation risks in cryptographic transition
Aztec said introducing new cryptographic systems too quickly could create immediate security vulnerabilities, even before quantum computing becomes a practical threat. The project identified implementation errors as a major concern and said its AI-assisted auditing tools had uncovered critical vulnerabilities that earlier human audits had not detected. According to the technical paper, those issues have been patched in an upcoming version 6 release.
The team also highlighted concerns about adopting cryptographic schemes before they have undergone sufficient scrutiny. Its paper cited the HAWK post-quantum signature proposal as an example of how weaknesses in a scheme’s underlying structure can undermine its security. Aztec said new cryptographic components will require extensive analysis and formally verified implementations before deployment.
Williamson said the network does not have a reliable estimate for when quantum computers could break widely used elliptic-curve cryptography. He also said the roadmap could accelerate if quantum computing developments indicate the threat is approaching sooner than expected.
The end-2030 target therefore represents Aztec’s planned migration deadline, not a prediction that quantum computers will be capable of breaking current blockchain cryptography by that date.
Also Read: Bitcoin, Ethereum Recover as US PPI Jumps and Liquidations Hit $937M
