Author: Naomi B. Lefkovitz
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Digital Identity 
Digital Identity Guidelines: Enrollment and Identity Proofing, Special Publication 800-63A, Revision 3
These guidelines provide technical requirements for federal agencies implementing digital identity services and are not intended to constrain the development or use of standards outside of this purpose. This guideline focuses on the enrollment and verification of an identity for use in digital authentication.
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Digital Identity 
Digital Identity Guidelines: Federation and Assertions, Special Publication 800-63C, Revision 3
These guidelines provide technical requirements for federal agencies implementing digital identity services and are not intended to constrain the development or use of standards outside of this purpose. This guideline focuses on the use of federated identity and the use of assertions to implement identity federations. Federation allows a given credential service provider to provide authentication and (optionally) subscriber attributes to a number of separately-administered relying parties.