Ripple Publishes Roadmap to Make XRP Ledger Quantum-Resistant by 2028

Apr 21, 2026

Ripple released a four-phase roadmap to make the XRP Ledger quantum-resistant by 2028, positioning itself ahead of Bitcoin and Ethereum on quantum security timelines. The plan addresses warnings that quantum computers could reverse-engineer private keys from exposed public keys, with analysts suggesting 2029 as Q-day for quantum threats. XRP, the world's fourth-largest digital asset, faces particular vulnerability for long-term holders whose public keys are already exposed on the blockchain. The roadmap includes emergency measures in Phase 1, vulnerability assessment and NIST-standard testing in Phase 2 (first half 2026), integration of quantum-resistant signatures in Phase 3 (second half 2026), and full deployment by 2028 in Phase 4. Ripple partnered with Project Eleven for testing and is exploring zero-knowledge proofs to enable safe fund migration without revealing private keys.

Quantum Computing Threats to XRP Ledger and Blockchain Security

▪Some analysts suggest 2029 as Q-day, the deadline to build defenses against quantum computers

Ripple's Four-Phase Quantum-Resistance Roadmap Through 2028

▪Ripple's Phase 2 is targeted for completion in the first half of 2026
▪Ripple will begin integrating quantum-resistant signatures alongside existing ones on its developer test network in Phase 3
▪Ripple is testing defenses suggested by the National Institute of Standards and Technology in Phase 2
▪Ripple's Phase 1 would implement a hard shift where classical public-key signatures would no longer be accepted by the XRP Ledger network
▪Ripple partnered with quantum security research firm Project Eleven for validator-level testing and developer networking benchmarking
▪Ripple will propose a new amendment to the XRP Ledger ecosystem for native post-quantum cryptography in Phase 4
▪Ripple released a four-phase roadmap to make the XRP Ledger quantum-resistant by 2028
▪Ripple's Phase 4 targets completion by 2028 and marks the full transition to deployment of quantum-resistant cryptography
▪Ripple's applied cryptography team is conducting a full assessment of quantum vulnerability across the XRP Ledger network in Phase 2
▪Ripple's Phase 1, called Q-Day readiness, is an emergency measure to protect exposed public keys if quantum computers arrive faster than expected