SharePoint 2013 Security and Authentication server class library
Find a list of the major security and authentication namespaces in SharePoint 2013 that run on servers.
Applies to: SharePoint Server 2013 | SharePoint Foundation 2013
The Security and Authentication class library reference for SharePoint 2013 lists .NET server namespaces. These namespaces contain classes and other members that are designed mainly to help you develop solutions for SharePoint end users and low-level administrators, such as site owners.
For classes that run on a client, see .NET client API reference for SharePoint 2013.