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Cryptography that underpins cryptocurrencies such as XRP has long been viewed as difficult to break. But advances in quantum computing are prompting blockchain developers to reassess how quickly networks must adapt. Ripple has published a four-phase roadmap aimed at bringing the XRP Ledger (XRPL) to full post-quantum readiness by 2028, responding to a growing quantum threat landscape.
Ripple’s stated position is that post-quantum readiness for XRPL will not be delivered through a single patch or one code amendment. Instead, the roadmap is designed around two parallel objectives: maintaining XRPL’s operational strengths during the transition and preparing for the possibility that quantum risks materialize earlier than expected.
Phase 1 focuses on the worst-case scenario. XRPL developers plan to implement a fallback path that would allow users to move their funds safely if classical cryptography were to fail. The team is also exploring the use of zero-knowledge proofs so users can demonstrate ownership in such circumstances.
Phase 2 is scheduled for the first half of 2026 and is described as already underway. It centers on proactive planning and experimentation with NIST-recommended quantum-resistant signature schemes aligned with XRPL’s transaction model.
J. Ayo Akinyele, Head of Engineering at RippleXDev, said the work is not a single upgrade. He described collaboration with Project Eleven on a proof-of-concept hybrid post-quantum signing implementation, including validator-level testing, Devnet benchmarking, and a post-quantum custody wallet prototype.
Phase 3, planned for the second half of 2026, will involve exploring post-quantum primitives. Ripple said this includes deploying candidate post-quantum signatures alongside existing elliptic curve signatures on Devnet to enable developer testing without changing the mainnet.
Phase 4 will include a formal amendment to the XRPL ecosystem for native post-quantum cryptography. The goal is to transition the network to quantum-resistant signatures at scale, targeting full deployment by 2028.
Ripple’s roadmap is framed against warnings that quantum computing could eventually undermine cryptographic systems used in major blockchains. The article cites a Nobel Prize-winning physicist involved in building Google’s quantum computers, who warned that Bitcoin could be among the earliest real-world targets of quantum attacks.
It also references research suggesting that a sufficiently advanced quantum computer could derive a Bitcoin private key from its public key in minutes, with fewer resources than previously thought. Google’s research estimates that fewer than 500,000 physical qubits could crack ECDSA-256.
The article notes that the same underlying vulnerability could apply across most major blockchains, including XRPL. It states that whenever an XRPL account signs a transaction, the public key is visible on-chain. In a post-quantum environment, that exposure could eventually be exploited.
According to J. Ayo Akinyele, the shift toward post-quantum readiness represents a fundamental architectural change in how digital assets are secured over the long term. He said the transition would affect key management, validator infrastructure, and how users interact with the XRP ecosystem.
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