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JA3 and JA4 hash the TLS ClientHello to reliably identify the client library. Why Chrome looks different from Firefox, and OpenVPN from both. Full breakdow

In a world where a single point of failure can throw our machines into chaos, everything from sharks to authoritarian governments and old ladies have brought the web to its knees.

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I’m part of the desktop software generation. From Windows 95 to Windows 7, I grew using mostly-offline software on computers operated via mouse and keyboard, well before tablets and smartphones. Recently, I’ve been missing one particular part of that era: its consistency in design. I want to tell you about

Have you ever needed to make sure your website has a broken certificate? While many tools exist to help run an HTTPS server with valid certificates, there aren’t tools to make sure your certificate is revoked or expired. This is not a problem most people have. Tools to help manage certificates are always focused on avoiding those problems, not creating them. Let’s Encrypt is a Certificate Authority, and so we have unusual problems we need to solve.

A modern, AI-native documentation platform with full MCP integration. Submit, discover, and explore documentation from any source.

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