Ripple Unveils Plan to Make XRP Ledger Quantum-Resistant by 2028

As quantum computing poses a potential threat to blockchain security, Ripple has devised a comprehensive plan to make the XRP Ledger quantum-resistant. The XRP Ledger, a decentralized layer-1 blockchain, is the foundation for Ripple's solutions and the native network for the world's fourth-largest digital asset, XRP. With Google recently warning of the potential for quantum computers to attack blockchains like Bitcoin with reduced computational power, the urgency to develop defenses has increased. Bitcoin developers are also working on countermeasures, with some analysts predicting 2029 as the deadline to establish quantum-resistant systems. Ripple's approach involves a four-phase plan to achieve full readiness by 2028. The plan addresses the risks posed by quantum computers, which can reverse-engineer private keys from exposed public keys, thereby compromising coin holdings. Accounts that have held coins for extended periods are particularly vulnerable, as the longer a public key is exposed, the greater the risk of a quantum attack. Building quantum-resistant systems is both a technical and operational challenge, affecting every XRP holder and application built on the XRP Ledger. The first phase, Q-Day readiness, is an emergency response designed to protect exposed public keys and long-held accounts if quantum computers emerge sooner than anticipated. This involves implementing a hard shift, where classical public-key signatures are no longer accepted, and all funds must migrate to quantum-safe accounts. Additionally, this phase explores enabling safe recovery for account owners via zero-knowledge proofs, allowing holders to migrate funds even in a compromised scenario. The second phase, already underway and targeted for completion in the first half of 2026, involves a thorough assessment of quantum vulnerability across the XRPL network and testing defenses recommended by the National Institute of Standards and Technology. However, post-quantum cryptography requires larger keys and signatures, which can strain the ledger, so the team is working to balance these tradeoffs. To accelerate this phase, Ripple has partnered with quantum security research firm Project Eleven for validator-level testing, developer networking benchmarking, and early custody wallet prototypes. The third phase, scheduled for the second half of 2026, involves the controlled integration of post-quantum measures. During this phase, Ripple will integrate quantum-resistant signatures alongside existing ones on its developer test network, allowing developers to test and build against the new cryptography without disrupting the live network. This phase addresses the operational challenge of migration, ensuring that the transition to quantum-resistant systems does not disrupt existing functionality. Furthermore, the team is re-examining the underlying cryptography of XRPL, exploring quantum-resistant approaches to privacy and secure data processing, which are crucial for compliant tokenization and features like confidential transfers. The final phase, targeted for completion by 2028, marks the full transition to native post-quantum cryptography, with the design, build, and proposal of a new amendment to the XRPL ecosystem for PQC-based signatures at scale. By following this four-phase plan, Ripple aims to ensure a seamless and less painful migration path, providing a significant advantage as the deadline for quantum readiness approaches.