Author: Paul A. Grassi
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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: Authentication and Lifecycle Management, Special Publication 800-63B, 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. These guidelines focus on the authentication of subjects interacting with government systems over open networks, establishing that a given claimant is a subscriber who has been previously authenticated.
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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.
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Digital Identity 
NIST Digital Identity Guidelines: Special Publication 800-63, Revision 3
These guidelines from the National Institutes of Standard and Technology provide technical requirements for federal agencies implementing digital identity services.