Ripple has released its quantum resistance roadmap, aiming to make its XRP Ledger quantum resistant by 2028.

According to Mars Finance, on April 21st, Ripple officially released its quantum resistance roadmap, with the core goal of making XRP Ledger (XRPL) quantum resistant by 2028. The roadmap primarily addresses the potential "harvest now, decrypt later" attack pattern, where attackers collect encrypted data now, waiting for future quantum computers to mature before cracking it. The entire plan will be implemented in four phases: Phase 1: Q-Day Contingency Preparedness (Already Launched). Establishing a quantum day (Q-Day) emergency response mechanism. If the existing classical encryption system is suddenly breached, the network will immediately stop accepting traditional public key signatures and forcibly migrate to quantum-secure accounts. Simultaneously, it will explore asset ownership verification schemes based on post-quantum ZK-proofs, allowing existing account holders to securely recover funds in emergencies without exposing vulnerable keys. Phase 2: Risk Assessment and Algorithm Testing (First Half of 2026). A comprehensive assessment of the impact of post-quantum cryptography on the XRP Ledger network performance, storage, and bandwidth. In collaboration with Project Eleven, we will conduct validator-level testing and Devnet benchmarking, deploy the NIST-standardized ML-DSA quantum-secure signature scheme, and develop a post-quantum escrow wallet prototype. Core engineer Denis Angell has already deployed ML-DSA signatures on XRPL's AlphaNet. Phase Three: Devnet Hybrid Integration (Second Half of 2026). We will integrate candidate post-quantum signature schemes in parallel with existing elliptic curve signatures on the developer network (Devnet), allowing developers to test performance and system impact without affecting the mainnet. Simultaneously, we will explore post-quantum zero-knowledge proof primitives and homomorphic encryption for confidential transfers to advance the privacy and compliance capabilities of tokenized real-world assets on XRPL. Phase Four: Full Mainnet Upgrade (Target 2028). We will submit a formal protocol amendment, which, after being approved by validators, will fully enable native post-quantum cryptography on the mainnet. The focus is on production readiness optimization: throughput tuning, validator reliability assurance, and coordinated migration of the ecosystem to ensure a full transition without impacting network speed and settlement finality.