Ripple has published a detailed roadmap to make the XRP Ledger (XRPL) fully quantum-resistant by 2028. The plan covers four phases, starting with emergency preparedness and ending with a full protocol upgrade. The move comes after Google Quantum AI research confirmed that the cryptography most blockchains rely on today could be broken by a powerful enough quantum computer.
Why Quantum Computing is a Real Threat To Crypto
The concern is not just theoretical anymore. Quantum computers are built differently from classical machines. Where a traditional computer processes data in binary, a quantum computer uses quantum bits, or qubits, that can represent multiple states simultaneously. This gives quantum machines the potential to crack certain types of encryption far faster than anything available today.
For blockchains, the specific risk is this: every time an account signs a transaction, its public key becomes visible on-chain. Think of it like writing your home address on the outside of an envelope. Anyone can see it, but they cannot read what is inside without your private key. A sufficiently advanced quantum computer, however, could reverse-engineer that private key from the public one, giving an attacker direct access to the funds.
Ripple also flagged a subtler risk known as "harvest now, decrypt later." Bad actors can collect publicly visible cryptographic data from blockchains today and store it, waiting until quantum hardware is powerful enough to crack it.
How Exposed Is XRP Compared To Bitcoin?
The exposure levels are very different between the two assets.
An April 2026 audit by XRPL validator "Vet" found that approximately 300,000 XRP accounts holding 2.4 billion XRP have never signed a transaction. Because their public keys have never appeared on the blockchain, they are not vulnerable to quantum attacks. Only two large dormant accounts with more than 21 million XRP and over five years of inactivity have exposed public keys, representing just 0.03% of the total XRP supply currently at risk.
Bitcoin faces a much larger problem. Roughly 32% of all Bitcoin, including an estimated one million coins linked to Bitcoin's pseudonymous creator Satoshi Nakamoto, is stored in a format that makes it easier for a quantum computer to target.
What Is Ripple's Four-Phase Plan?
Ripple's roadmap is built around two parallel goals: preserving XRPL's current performance while preparing for a worst-case scenario where classical cryptography breaks sooner than expected.
Here is how the four phases break down:
Phase 1 (Q-Day Readiness): A contingency plan is already in development. If existing cryptography breaks unexpectedly, XRPL would enforce a hard shift away from classical signatures. Ripple is exploring post-quantum zero-knowledge proofs to let users prove wallet ownership and migrate funds safely, even in a compromised environment.
Phase 2 (First Half Of 2026): Full assessment of quantum risk across the network. Ripple will test NIST-recommended post-quantum signature schemes in collaboration with Project Eleven, which is building a hybrid post-quantum signing prototype including validator-level testing and a post-quantum custody wallet.
Phase 3 (Second Half Of 2026): Post-quantum signature schemes will run alongside existing elliptic curve signatures on Devnet for developer testing. Ripple will also explore post-quantum-friendly primitives for zero-knowledge proofs and homomorphic encryption to support privacy features in tokenization use cases.
Phase 4 (Targeting 2028): A formal amendment to the XRPL ecosystem will introduce native post-quantum cryptography across the full network.
Where XRPL Already Has An Advantage
XRPL already supports native key rotation, which lets users switch to new, more secure keys without moving funds to a new account. Ethereum has no equivalent feature built into its protocol.
Any post-quantum migration on Ethereum would require users to manually transfer assets to entirely new accounts. XRPL's seed-based key generation also enables deterministic derivation of new keys, giving it a practical foundation that most other networks would have to build from scratch.
Conclusion
Ripple's post-quantum roadmap is one of the most detailed published by any blockchain project to date. With 0.03% of XRP supply currently at risk and a structured four-phase plan targeting full transition by 2028, XRPL is in a comparatively strong position. The cryptography is not broken today, but Ripple's argument is clear: preparation timelines now matter.
Resources
Blog article by Ripple: Post-Quantum Readiness on the XRP Ledger
Report by CoinDesk: Ripple wants the XRP Ledger to be quantum-proof by 2028. Here is its plan
Report by Benzinga: Ripple Gets Quantum-Ready With Multi-Phase XRP Ledger Update Plan
Paper by Google: Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities: Resource Estimates and Mitigations