SSL

In Full (strict) mode, Cloudflare encrypts all traffic between visitors and your origin server while strictly validating the origin’s SSL certificate to ensure it’s valid, unexpired, and issued by a trusted authority like a public CA or Cloudflare’s Origin CA.[1][4][5] This setup provides end-to-end encryption without exposing your server to unverified connections, preventing man-in-the-middle attacks.[4] Why Use Full (Strict) SSL Mode? Cloudflare offers several SSL/TLS encryption modes, but Full (strict) stands out for maximum security: ...

Introduction If you put anything on the internet—an API, a website, an admin portal—you need SSL/TLS. It’s what turns http into https, encrypts traffic, and lets users verify they’re talking to the right server. But “turn on TLS” hides a lot of complexity: ciphers, certificates, OCSP, mTLS, key rotation, HTTP/2, QUIC, and more. This in-depth, zero-to-hero guide demystifies SSL/TLS. You’ll learn the concepts, how the protocol works, how to issue and deploy certificates, how to configure popular servers securely, how to test and monitor, and how to avoid common pitfalls. By the end, you’ll be able to ship production-grade TLS with confidence. ...