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arXiv · 2504.12062

A Scalable Framework for Post-Quantum Authentication in Public Key Infrastructures

Antonia Tsili·Konstantinos Kordolaimis·Konstantinos Krilakis·Dimitris Syvridis
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Abstract

This work explores the performance and scalability of a hierarchical certificate authority framework with automated certificate issuance employing post-quantum cryptographic (PQC) signature algorithms. The system is designed for compatibility with both classical and PQC algorithms, promoting crypto-agility while ensuring robust security against quantum-based threats. The proposed framework design expects minimal cryptographic requirements from potential clients, protects certificates of high importance against cross-dependent chains-of-trust and allows for prompt switching between classical and PQC algorithms. Finally, we evaluate SPHINCS$^+$, Falcon, and Dilithium variants in various configurations of certificate issuance and verification accommodating a large client base, underlining the trade-offs in balancing performance, scalability, and security.

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Antonia Tsili, Konstantinos Kordolaimis, Konstantinos Krilakis, Dimitris Syvridis. 2025-04-16. A Scalable Framework for Post-Quantum Authentication in Public Key Infrastructures. https://arxiv.org/abs/2504.12062

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