Cloudflare Pursuing Establishment of Quantum-Resistant Public Certificate Authority
Published2026.10.01 10:11The new CA will support both existing TLS certificates and next-generation Merkle Tree Certificates (MTC), providing an environment where website operators can transition to a quantum-resistant security system without building separate infrastructure, the company explained.
Additionally, it has agreed to acquire existing authorized root CA key materials held by GlobalSign, and the transaction is expected to be completed within two months.
Additionally, a significant portion of existing certificate infrastructure was built before quantum computing emerged as a practical threat.
△Public disclosure of transparent operations and provision of reproducible code builds △Uninterrupted certificate replacement using automatic renewal signals (RFC 9773) △Application of quantum-resistant security through MTC based on Internet Engineering Task Force (IETF) draft specifications △Support for phased transition through parallel management of existing TLS certificates and MTC.
Additionally, it has applied for registration in the root programs of Chrome, Apple, Microsoft, and Mozilla, and plans to begin issuing certificates using the existing method after completing the approval process.
MTC is structured to verify trust registry registration status in a simplified manner without needing to transmit large-capacity quantum-resistant signatures with each connection, allowing the company to implement quantum-resistant security while reducing performance burden, according to the company.
Applicability has been confirmed through experiments with Chrome, and production-ready MTC is planned to be issued starting in Q1 2027.
Engineering updates and early access applications related to the new public CA can be found on the Cloudflare blog.
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