Ripple and XRPL Foundation Partner With Project Eleven to Build Post-Quantum Ledger Security

The XRP Ledger is moving beyond theoretical quantum threat assessments — Ripple and the XRPL Foundation have engaged post-quantum cryptography firm Project Eleven to implement practical hardening across the network's validator, custody, and wallet layers.

Ripple and the XRP Ledger Foundation announced a partnership with post-quantum cryptography firm Project Eleven to prepare the XRP Ledger for potential future threats posed by quantum computing. The collaboration, reported by U.Today on May 19, 2026, moves beyond research to active engineering work on the XRPL protocol.

Project Eleven will begin with a comprehensive audit of the XRPL's validator layer, custody systems, networking infrastructure, and wallet cryptography. Following the audit, the firm plans to deploy a prototype quantum-secure custody wallet and implement "hybrid signatures" — a layering approach that adds quantum-resistant cryptographic operations on top of the network's current security standards without replacing them immediately.

Why Quantum Threats Are Being Addressed Now

Current blockchain cryptographic standards — including those used by Bitcoin, Ethereum, Solana, and XRP — rely on elliptic curve cryptography that would be vulnerable to sufficiently powerful quantum computers. No quantum computer capable of breaking these standards exists today.

However, several timeline pressures are driving early action. The U.S. federal government has mandated that federal systems migrate to post-quantum security by 2035. Google has publicly targeted 2029 as a relevant quantum capability threshold. The XRPL Foundation notes that the XRP Ledger's account-based architecture and built-in key rotation mechanism make its migration path less disruptive than proof-of-work chains, since users can upgrade to quantum-resistant signatures without changing their public "r-addresses."

"While every major blockchain faces the same cryptographic exposure, the industry's response has largely remained in the research phase," said Alex Pruden, CEO of Project Eleven, in statements reported by U.Today.

The Hybrid Signature Approach

The hybrid signature strategy — layering quantum-resistant algorithms over existing ECDSA operations — is a standard transitional approach recommended by cryptographic standards bodies. It allows a network to begin protecting new transactions against future quantum decryption attempts while maintaining backward compatibility with legacy address formats.

The XRPL Foundation noted that the network's native architecture makes the migration process less cumbersome than many other blockchain systems. Key rotation is a native feature of the XRP Ledger account model, meaning users and institutional custodians can update their signing keys to quantum-resistant variants without creating new account addresses.

Context: Ripple's Broader Security Initiative

This partnership extends Ripple's AI-assisted security overhaul announced in March 2026. At that time, Ripple disclosed that it had established an AI red team focused on continuous analysis of XRPL codebase interactions. The quantum security work with Project Eleven is a separate but parallel initiative addressing a longer-horizon threat category.

Sources

• U.Today, "Ripple and XRPL Foundation Team Up on Quantum Security," May 19, 2026
• U.Today, "XRP Upgrade Nears Rollout With Critical Fixes Across Several Features," May 17, 2026
• Project Eleven official announcement, May 2026