1X.509 2===== 3 4X.509 is an ITU-T standard for a `public key infrastructure`_. X.509v3 is 5defined in :rfc:`5280` (which obsoletes :rfc:`2459` and :rfc:`3280`). X.509 6certificates are commonly used in protocols like `TLS`_. 7 8.. toctree:: 9 :maxdepth: 2 10 11 tutorial 12 certificate-transparency 13 ocsp 14 reference 15 16.. _`public key infrastructure`: https://en.wikipedia.org/wiki/Public_key_infrastructure 17.. _`TLS`: https://en.wikipedia.org/wiki/Transport_Layer_Security 18