This publication and associated companion volumes — [SP800-63], [SP800-63A], and [SP800-63B] — provide technical guidelines to organizations on the implementation of digital identity services.
This document provides requirements to identity providers (IdPs) and relying parties (RPs) of federated identity systems. Federation allows a given IdP to provide authentication attributes and (optionally) subscriber attributes to a number of separately administered RPs through federation protocols and assertions. Similarly, RPs can use more than one IdP as sources of identities.