XRP Ledger Targets Quantum Defense Upgrade by 2028

Preparing for the Quantum Era

Imagine a supercomputer so fast that it could unlock encrypted digital locks across the internet in seconds. That is the theoretical threat of quantum computing. While quantum machines capable of cracking modern encryption do not exist today, blockchain developers are already building defenses.

The XRP Ledger Foundation has published new research detailing a proposal to protect user accounts and network validators against future quantum attacks. This work forms part of the protocol roadmap for 2027, working toward full quantum readiness by 2028.

Replacing core security features on a live, global network takes years of planning. By starting early, developers aim to protect user funds and network consensus before quantum hardware becomes a practical risk.

Upgrading Cryptography with ML-DSA-44

Currently, accounts on the XRP Ledger rely on standard cryptographic algorithms known as secp256k1 and Ed25519. These algorithms keep transactions secure under normal computing conditions.

However, theoretical research shows that a powerful quantum computer running Shor's algorithm could eventually compromise these standard signatures. If successful, an attacker could potentially impersonate legitimate account holders or validators.

To prevent this, the XRP Ledger Foundation proposes introducing ML-DSA-44, a standardized post-quantum digital signature algorithm. This new cryptographic standard is designed to withstand quantum-level decryption attempts.

The proposed upgrade would apply across three primary components of the network:

• User Accounts: Allowing wallet holders to replace traditional keys with quantum-resistant alternatives.
• Network Validators: Securing the servers that verify transactions and maintain consensus.
• Validator List Publishers: Protecting trusted entities that establish which validators participate in network consensus.

Technical Costs and Infrastructure Impact

Upgrading cryptographic strength involves clear trade-offs. Post-quantum signatures require significantly more storage space than conventional signatures, which places new demands on network infrastructure.

For context, a standard payment transaction on the XRP Ledger uses about 1,704 bytes of data. Under the proposed ML-DSA-44 standard, that same transaction would require roughly 5,331 bytes.

This represents a 213% increase in transaction size. Larger transaction sizes increase overall network bandwidth requirements, expand blockchain storage history, and elevate operational costs for node operators.

The research also details the expected resource commitments required to complete the upgrade:

• Development Effort: Estimated at 640 core development hours.
• Code Review: Estimated at 400 additional review hours.
• Financial Costs: Projected between $215,000 and $255,000 for audits and security reviews, excluding initial development expenses.

The proposal highlights several unresolved operational questions. Developers must still address potential adjustments to transaction fee structures, account migration protocols, and security risks if legacy master keys remain enabled.

Testing Schedule and Future Roadmap

Initial testing of the post-quantum signatures has already taken place in the network's Alpha Net environment. However, extensive testing and security verification remain before any deployment on the main network.

The Foundation's roadmap outlines the following schedule:

1. First Half of 2027: Conducting a comprehensive migration study to evaluate account transitions.
2. Late 2027 to 2028: Executing core development, extensive code reviews, and third-party security audits.
3. 2028 Target: Achieving complete protocol readiness for post-quantum signatures.

No official activation date for the main network has been approved yet. Any core change to the protocol must complete standard governance and voting processes.

This research builds on RippleXRP-2.19%'s broader four-phase quantum strategy introduced earlier. That plan includes experimental deployments, contingency research, and ongoing collaboration with security firm Project Eleven to test hybrid signature systems and custody wallet prototypes.

How Other Blockchains Are Preparing

The XRP Ledger is not alone in exploring post-quantum defenses. Other major blockchain communities are actively researching similar security transitions:

• BitcoinBTC-1.44%: Developers are discussing BIP 360 to minimize public key exposure. Additionally, Bitcoin Core developer Cory Fields proposed theoretical 'quantum landmines' to deter prospective exploiters.
• EthereumETH-3.54%: Developers have integrated post-quantum research into their long-term roadmap, targeting updates to validator infrastructure around 2029.
• SolanaSOL-3.78%: Engineers are studying alternative schemes, such as the Falcon post-quantum signature algorithm.
• Starknet: Researchers are exploring a potential migration from an Ethereum Layer 2 to an independent Layer 1 to gain direct control over post-quantum implementation.

What This Means for Network Security

No quantum computer today has demonstrated the capacity to break blockchain encryption. However, because network-wide cryptographic migrations require years to develop, test, and deploy, early research remains a central priority.

By advancing its research roadmap today, the XRP Ledger Foundation aims to establish native post-quantum signature support well ahead of potential future risks.