blog.cloudflare.com· Sep 29, 2026· by Mari Galicer

Building a post-quantum certificate authority with Merkle Tree Certificates

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As post-quantum signatures threaten to inflate TLS handshakes and certificate transparency logs, Merkle Tree Certificates offer a path to compact, auditable authentication. Cloudflare’s new certificate authority will support MTC issuance at scale.
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.
#Birthday Week#Certificate Transparency#Cryptography#Post-Quantum#Security#TLS