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

As quantum computing poses a potential threat to blockchain security, Ripple has developed a detailed roadmap to make the XRP Ledger, a decentralized layer-1 blockchain, resistant to quantum attacks by 2028. The XRP Ledger is the foundation for XRP, the fourth-largest digital asset by market capitalization, and is utilized by Ripple's solutions. Ripple is among the developers contributing to the XRP Ledger ecosystem. This announcement follows Google's warning that a quantum computer could potentially compromise Bitcoin, the largest blockchain, with less computational power than previously estimated, prompting concerns about the urgency to develop defenses against quantum threats. Bitcoin developers are also working on measures to mitigate these risks. To understand the threat to the XRP Ledger, it's essential to examine the implications of quantum computing on blockchain security. A quantum computer can reverse-engineer private keys from exposed public keys, allowing hackers to drain coin holdings. Accounts that have held coins for extended periods are at higher risk, as the longer the public key is exposed, the more time a quantum attacker has to target it. Furthermore, building quantum-resistant systems is not only a technical challenge but also an operational one, as it affects every XRP holder and application built on the XRP Ledger. Ripple's four-phase plan aims to address these challenges. Phase 1, Q-Day readiness, is an emergency measure to protect exposed public keys and long-held accounts if quantum computers become a reality sooner than expected. This phase involves implementing a hard shift, where classical public-key signatures will no longer be 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. Phase 2, already underway, involves a comprehensive 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 the tradeoffs and necessary system changes. To accelerate this phase, Ripple has partnered with Project Eleven for validator-level testing, developer networking benchmarking, and early custody wallet prototypes. Phase 3, targeted for completion in the second half of 2026, involves the controlled integration of post-quantum measures. In 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 effort required for migration and explores quantum-resistant approaches to privacy and secure data processing. Phase 4, targeting completion by 2028, marks the full transition to full deployment, where Ripple will design, build, and propose a new amendment to the XRPL ecosystem for native post-quantum cryptography and begin transitioning the network to PQC-based signatures at scale. The four-phase plan aims to ensure a seamless and less painful migration path, which could provide a significant advantage as the deadline to build defenses against quantum threats approaches.