Developers overseeing Ripple’s XRP Ledger have outlined a comprehensive strategy to enhance the network’s defenses against quantum computing threats. The team has selected ML-DSA-44, a digital signature algorithm that received approval from the National Institute of Standards and Technology (NIST) in 2024, as the cornerstone of this transition.
Quantum-resistant upgrade plan
Ripple, a leading blockchain payments technology company, introduced a multi-stage roadmap earlier in 2024 to prepare the XRP Ledger for emerging quantum risks. The initiative aims to ensure that the network is fully quantum-resistant by 2028.
The adoption of ML-DSA-44 will substantially increase the storage requirements of XRP Ledger transactions. Each quantum-secure public key and signature will use 3,732 bytes, a significant rise from the current 105 bytes required for traditional signatures. The developers plan to audit the implementation in mid 2027. Achieving this security comes with a price: rigorous testing is estimated at $255,000 and about 640 development hours before external audit costs are included.
Ripple’s developers have outlined that implementing ML-DSA-44 will result in an increase in transaction data requirements but have emphasized their commitment to achieving full quantum resistance across the XRP Ledger by 2028.
Quantum risks and mitigation strategies
According to research in quantum computing, the emergence of quantum-powered attacks poses unique risks to existing blockchain security. One critical concern is the vulnerability of public keys displayed during transactions, which could potentially be exploited by quantum-enabled attackers.
A subtler risk known as the ‘harvest now, decrypt later’ scenario has also been highlighted by elliptic curve cryptography researchers. In this model, malicious actors may collect encrypted public blockchain data now, with the intention of deciphering it once quantum computing capabilities reach sufficient maturity.
Mini dictionary: ML-DSA-44 is a post-quantum digital signature algorithm approved by NIST. It is designed to protect data against attacks from future quantum computers, providing enhanced security compared to traditional signature schemes.
Technical implications for XRP Ledger
In practice, the storage required per transaction will increase to 5,331 bytes after considering database overhead, according to developers’ documentation. However, this expansion is not expected to raise user transaction fees, as node operators are expected to shoulder the additional data burden. The shift covers quantum-resistant key generation across Python, JavaScript, and server environments, with initial deployment testing set for early 2027.
The XRP Ledger Foundation, a non-profit organization dedicated to advancing the XRP Ledger ecosystem, is coordinating the quantum resistance study’s inaugural phase. Developers are also integrating zero-knowledge proof (ZKP) techniques to enable secure validation results without exposing sensitive information.
Mini dictionary: Zero-knowledge proof (ZKP) is a cryptographic technique that allows one party to prove to another that a statement is true, without revealing any specific data beyond the validity of the statement itself. ZKPs help increase privacy and security in blockchain transactions.
| Specification | Traditional Signature | ML-DSA-44 (Quantum-resistant) |
|---|---|---|
| Public key + signature size | 105 bytes | 3,732 bytes |
| Storage per secure transaction (with overhead) | 147 bytes | 5,331 bytes |
| Target readiness year | N/A | 2028 |
While post-quantum security remains a major challenge for most blockchain networks, XRP Ledger’s development team is advancing its protection roadmap to anticipate and counteract the anticipated threat of quantum computing. The project’s published timeline targets full readiness for this new era by 2028.
