Identity provider

An identity provider (IDP) is an organization that is "[r]esponsible for the processes associated with enrolling a subject, and establishing and maintaining the digital identity associated with an individual or non-person entity (NPE). These processes include identity vetting and proofing, as well as revocation, suspension, and recovery of the digital identity. The IDP is responsible for issuing a credential, the information object or device used during a transaction to provide evidence of the subject’s identity; it may also provide linkage to authority, roles, rights, privileges, and other attributes."

Source
The White House, (Draft) National Strategy for Trusted Identities in Cyberspace: Creating Options for Enhanced Online Security and Privacy 33 (June 25, 2010).