Ripple Unveils Quantum-Resistant Roadmap for XRP Ledger

Ripple has announced its plans to ensure the XRP Ledger remains secure against future quantum threats. The company's roadmap aims to achieve quantum resistance by 2028, mitigating potential attacks that could compromise current cryptographic systems.

The four-phase plan is designed to address the 'Harvest now, decrypt later' attack model, where attackers collect encrypted data and wait for mature quantum computers to break it. Phase One has already started, establishing a Quantum Day (Q-Day) emergency response mechanism. If classical cryptography systems are suddenly compromised, the network will immediately stop accepting traditional public key signatures and migrate to quantum-safe accounts.

Phase Two involves comprehensive risk assessments and algorithm testing in collaboration with Project Eleven. Validators will conduct level testing and Devnet benchmarking using the NIST-standardized ML-DSA signature scheme. A prototype for post-quantum custody wallets is also being developed, with lead engineer Denis Angell deploying ML-DSA signatures on XRPL's AlphaNet.

Phase Three focuses on Devnet hybrid integration, where candidate post-quantum signature schemes and existing elliptic curve signatures will be integrated in parallel. This allows developers to test performance and system impacts without affecting the mainnet. Post-quantum zero-knowledge proof primitives and homomorphic encryption technologies for Confidential Transfers are also being explored.

The final phase, targeted for 2028, involves a full mainnet upgrade with formal protocol amendments and validator approval. The focus will be on production-ready optimization, ensuring a smooth transition without impacting network speed and settlement finality.