X.509
=====
X.509 is an ITU-T standard for a `public key infrastructure`_. X.509v3 is
defined in :rfc:`5280` (which obsoletes :rfc:`2459` and :rfc:`3280`). X.509
certificates are commonly used in protocols like `TLS`_.
.. toctree::
:maxdepth: 2
tutorial
reference
.. _`public key infrastructure`: https://en.wikipedia.org/wiki/Public_key_infrastructure
.. _`TLS`: https://en.wikipedia.org/wiki/Transport_Layer_Security
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