Automatically Secure: how we upgraded 6,000,000 domains by default to get ready for the Quantum Future
Sep 24, 2025Alex Krivit, Suleman Ahmad, Yawar Jamal
Summary
This post details the implementation and results of Automatic SSL/TLS, a system that automatically scans and upgrades origin server TLS configurations to the most secure mode supported. It explains the technical evolution of TLS, the challenges of securing the edge-to-origin connection, and the mechanics of how Automatic SSL/TLS works by crawling websites, comparing HTTP/HTTPS content, and checking TLS certificates. It highlights the improvement from the previous SSL/TLS Recommender, which had low adoption, to an automated system that has secured over 6 million domains.
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