Ripple has unveiled a four-stage roadmap to make its XRP Ledger (XRPL) resilient against quantum computers. The company aims to complete the entire transition by 2028. The plan encompasses a broad process ranging from emergency protocols to a full network update.
Is the threat real?
The risk of quantum computers to blockchain security has long been a theoretically assessed topic. However, Google's recent announcement has reignited this debate: According to the company, a quantum computer could attack the Bitcoin network with a computing power far below previous estimates. Some analysts point to 2029 as "Q-day," the estimated date when a quantum machine capable of breaking the current cryptographic infrastructure could become operational.
In the case of XRPL, the threat is three-layered. When each transaction is signed, the account's public key becomes visible on the chain. A quantum computer could reverse engineer the private key from this public key; that is, it could gain access to the assets in the account. Moreover, accounts whose public keys have been visible on the chain for a long time are at greater risk: The longer the key is visible, the more time a potential attacker is given. There is also an operational dimension: The transition to quantum-resistant systems is not just a technical matter; it is a process that directly affects millions of XRP users and all applications built on XRPL.
Four-stage plan
The first stage is called "Q-day preparation" and is an emergency protocol. In this stage, which will be activated if the quantum threat occurs earlier than expected, classical public key signatures will no longer be accepted by the network; it will be mandatory to move all funds to quantum-secure accounts. In addition, zero-knowledge proofs will be used to allow account holders to prove ownership without disclosing their keys. This method allows assets to be transferred securely even if the key is compromised; no one will lose their funds.
The second stage is already underway and is planned to be completed in the first half of 2026. Ripple's applied cryptography team will identify all quantum vulnerabilities in the network; The team will test post-quantum cryptography algorithms proposed by the US cybersecurity standards agency NIST.
However, these algorithms come at a cost: larger keys and signatures consume more system resources. Therefore, the team is evaluating the necessary system changes and balances at this stage. Quantum security research firm Project Eleven is partnering with Ripple in this process, conducting validator-level tests and early prototyping.
In the third phase, in the second half of 2026, quantum-resistant signatures will be integrated into the test network along with existing signature methods. Developers will be able to work with the new cryptography without touching the live network. At this stage, Ripple aims not only to change signature methods but also to rethink XRPL's cryptographic foundations on a broader scale: quantum-resistant approaches are also being explored for privacy and secure data processing. These are critical for features such as compliant tokenization and confidential transfers.
The fourth and final phase covers the full transition, planned to be completed by 2028. Ripple will prepare a new amendment proposal to be submitted for approval to the XRPL ecosystem and will fully migrate the network to post-quantum cryptography-based signatures.
Why now?
Bitcoin developers are also conducting similar work, so this is not a concern unique to Ripple. However, Ripple's roadmap is noteworthy: The four phases are designed to include a possible early Q-day scenario, and the transition process is structured to take place with as little disruption as possible. Meanwhile, the XRP price is trading at $1.44.
