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WS-Federation

Active Directory Federation Services (ADFS) is web services-based solution from Microsoft for federated single sign-on (SSO). ADFS runs on a Windows server and accomplishes SSO by letting partners securely share identity information of a user and access rights across a secure network. ADFS extends SSO functionality to internet applications, letting users have a seamless web SSO interaction when they access web-based applications of the organization.

ADFS uses the following specifications:

For WS specifications and background documentation, and information about ADFS profiles, go to the Microsoft website.