- Ripple is not taking any chances on the XRP Ledger following Google’s warning about the early arrival of Q-Day.
- The company has released a multi-phase roadmap to ensure the seamless transition of XRPL to post-quantum cryptography.
The Google Quantum AI team recently warned that Q-Day, the day when quantum computers will gain the capability to break the cryptographic model of Bitcoin (BTC) and other cryptocurrencies, is closer than what the public initially expected. Many downplayed the warning, including Bitcoin OG and Blockstream CEO Adam Back, but Ripple is not taking any chances with the XRP Ledger (XRPL).
Google’s Q-Day Warning
On March 31, Google corrected previous assumptions that a quantum computer needs at least 13 million qubits to break Bitcoin’s elliptic-curve cryptographic design in a day. Researchers from the tech giant clarified that it could do just that in minutes, using fewer than 500,000 physical qubits or 1,200 to 1,450 high-quality qubits.
Given the updated findings, Google estimates that Q-Day may arrive as early as 2029. The schedule is a decade sooner than what the consensus of cybersecurity, computer, and cryptographic experts suggested before.
Ripple’s Response to the Looming Quantum Threat in XRP Ledger
Like any other blockchain, the XRPL is not quantum-proof because it uses the same elliptic curve cryptography as Bitcoin. It means the ledger can be cracked by Shor’s algorithm on quantum computers when the time comes.
Ripple stated in a blog post written by Ayo Akinyele, Senior Director of Engineering at RippleX, that crypto assets are not yet at risk. However, the quantum threat has now shifted from “theoretical to credible.”
Additionally, the company confirmed that the “harvest now, decrypt later” stage has commenced. It’s a process in which bad actors are already capturing details from encrypted data today, so they can untangle them once quantum computers gain the capacity to penetrate their security. Hence, RippleX, the institution’s developer-focused division, highlighted the need to start planning for Post-Quantum (PQ) migration.
A Multi-Structured Solution
Fortunately, XRP currently has the building blocks for PQ resiliency baked in its system, particularly key rotation and seed-based key generation. The features enable it to support forward migration without disrupting user activities.
For context, key rotation allows users to gradually shift to quantum-resistant keys without changing accounts. Meanwhile, seed-based key generation involves the deterministic derivation of new keys from a single master seed.
The elements pave the way for the smooth implementation of Ripple’s multi-phased roadmap for XRP, which includes the following:
1st Phase: Post-Quantum Recovery
Interestingly, Ripple has already prepared XRP in case quantum computing advances faster than expected. If it suddenly becomes powerful enough to launch an attack against traditional cryptography, the ledger will trigger a hard shift. The network will force funds to migrate to quantum-secure accounts by no longer accepting public-key signature standards.
Ripple is exploring the use of PQ-based zero-knowledge proofs (ZKPs) to prove ownership of keys without exposing them. The contingency plan will let all users to move funds, even in a compromised cryptographic environment, for safe recovery. The XRPL seed-based key generation protocol complements the last-resort solution.
2nd Phase: Planning and Experimentation
Ripple has already begun assessing the full impact of PQ on XRPL in the first half of 2026. Moreover, it has started simulating National Institute of Standards and Technology (NIST)-standard algorithms to explore the trade-offs of PQ migration with respect to on-chain transaction performance, storage, cost, bandwidth, and other factors.
The company expects the larger key signatures to have significant implications for the ledger. Therefore, it’s carefully mapping their integration together with Project Eleven, a PQ firm focused on digital assets.
3rd Phase: PQ Primitives
Ripple aims to start the third phase by the second half of 2026. As developers explore the trade-offs of PQ on XRPL, they will run parallel experiments integrating several PQ signature schemes alongside existing elliptic-curve signatures on Devnet for application developers’ testing.
Furthermore, developers will explore post-quantum-friendly primitives for ZKPs and homomorphic encryption. The latter is a form of encryption that allows computation directly on encrypted data, or ciphertext, without first decrypting it. The process enables the data to remain confidential while the system processes it.
4th Phase: Full Transition to PQ Signatures
The last phase is Ripple’s execution of the amendments to the XRPL ecosystem. The company targets a full PQ transition no later than 2028, a year ahead of Google’s predicted Q-Day.
Ripple highlighted that insights from the experimentation phase will enable the seamless transformation of XRPL to PQ cryptography (PQC)-ready signatures at scale. The multi-phased roadmap will ensure the ledger’s evolution toward a PQC-ready state while tightening its performance and throughput, without placing significant strain on overhead or on validators’ operations in meeting XRPL’s high standards for reliability and fast deterministic settlement.
More Than a Technical Challenge
Ripple warned that XRPL’s exposed public key on-chain every time an account signs a transaction makes it vulnerable in a PQ environment. Likewise, it said that long-existing accounts that hold value over long periods are the “most important to protect.”
The company emphasized that the PQ is more than a technical challenge; it’s also an operational issue. The matter affects all XRP holders and every application on the ledger.
Final Thoughts
Overall, Ripple’s latest report demonstrates that XRP already has the foundations for PQ-resiliency, and it’s just a matter of leveraging them to beat the eventual arrival of the dreaded Q-Day. So far, its multi-phased roadmap indicates it’s not leaving anything to chance as it races against time, without compromising the ledger’s performance, efficiency, and reliability.
