Stellar introduced a Quantum Preparedness Plan (QPP) outlining a multi-year strategy to transition its blockchain network toward quantum-resistant cryptography. The initiative aims to protect the network against future quantum computer threats while maintaining compatibility with existing accounts and transaction records. The plan is expected to culminate in a native protocol upgrade by the end of 2027, enabling users to add quantum-safe signers without disrupting current functionality. The move addresses growing concerns that advanced quantum computers could undermine cryptographic systems like the Ed25519 signature scheme currently used by Stellar and other blockchain networks.
Stellar Identifies Two Primary Quantum Security Risks
Stellar highlighted two primary security concerns associated with quantum computing. The first involves the potential compromise of validator signatures, which could affect network consensus and overall blockchain security. The second threat involves account takeovers resulting from the ability to derive private keys from publicly available cryptographic information.
The challenge is particularly significant because many blockchain accounts remain inactive for extended periods. Dormant accounts could become vulnerable if users fail to migrate to more secure cryptographic standards before quantum threats become practical.
Recent developments have intensified these concerns. Researchers at INRIA reportedly reduced the number of logical qubits required to compromise 256-bit elliptic curve cryptography. The National Institute of Standards and Technology has revised its risk assessment timeline, suggesting that practical threats could emerge by 2029 or even sooner.
Account Architecture Enables Seamless Cryptographic Migration
Stellar's account architecture separates account identities from signing keys. Unlike many blockchain networks where addresses are directly linked to public keys, this design allows users to update or replace signers through existing account management functions without changing wallet addresses or transferring funds.
This structural advantage enables users to adopt quantum-safe signing methods without changing addresses or migrating assets, simplifying the transition process significantly.
Stellar Announces Three-Phase Implementation Timeline
The roadmap will be implemented in three stages over the coming years.
During the first phase in 2026, Stellar plans to introduce support for post-quantum signature verification within Soroban smart contracts. The network will initially support NIST-approved standards, including ML-DSA-44 and ML-DSA-65. This stage will enable enterprises and wallet providers to begin migrating to quantum-safe contract accounts.
The second phase, scheduled for 2027, will involve a Core Advancement Proposal introducing native quantum-safe signer types for traditional accounts. Existing account holders will be able to add quantum-resistant signers alongside their current Ed25519 keys. By the end of 2027, all Stellar accounts are expected to gain access to native quantum-safe signer options through a protocol upgrade based on established post-quantum cryptographic standards.
The final phase will focus on the gradual retirement of Ed25519 signatures for new transactions. The timeline for this transition will depend on developments in quantum computing and the readiness of the broader ecosystem. Stellar indicated that community discussions would help determine how dormant accounts should be handled, including potential recovery solutions.
Ecosystem Collaboration Required for Successful Transition
The initiative builds upon existing NIST standards and incorporates lessons from post-quantum planning efforts across the blockchain sector. Stellar acknowledged that additional research is still required for zero-knowledge proof systems that rely on cryptographic curves vulnerable to quantum attacks.
Successful implementation will require coordination among validators, wallet providers, custodians, anchors, exchanges, and developers. The Stellar Development Foundation plans to publish technical specifications, facilitate community discussions, and begin rolling out protocol upgrades in the weeks ahead.
The Quantum Preparedness Plan represents a long-term effort to future-proof the Stellar network against emerging quantum threats while preserving compatibility for users, developers, enterprises, and infrastructure providers.
FAQ
What is Stellar's Quantum Preparedness Plan?
Stellar's Quantum Preparedness Plan (QPP) is a multi-year strategy to transition its blockchain network toward quantum-resistant cryptography. The plan includes a protocol upgrade by the end of 2027 that will allow users to add quantum-safe signers to their accounts without disrupting existing functionality or changing wallet addresses.
When will Stellar implement quantum-safe cryptography?
Stellar will implement quantum-safe cryptography in three phases. The first phase in 2026 will introduce post-quantum signature verification in Soroban smart contracts supporting ML-DSA-44 and ML-DSA-65 standards. The second phase in 2027 will introduce native quantum-safe signer types for traditional accounts through a Core Advancement Proposal. The final phase timeline will depend on quantum computing developments and ecosystem readiness.
Why does Stellar's account architecture simplify quantum-safe migration?
Stellar's account architecture separates account identities from signing keys, unlike many blockchain networks where addresses are directly linked to public keys. This design allows users to update or replace signers through existing account management functions without changing wallet addresses or transferring funds, enabling seamless adoption of quantum-safe signing methods.
