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2.2.2 Home Agency IdP

NIST PIV and digital identity SP 800-217 (Draft)
All changes in this version
first version loaded 2 Architecture 405 part of 2.2

Title

Home Agency IdP

Control

When a home agency officially endorses a specific PIV IdP for the PIV identity accounts that the agency issues, that IdP is known as the home agency IdP for that population of PIV identity accounts. The home agency IdP is often run by the home agency, but operations can be outsourced to a third party through a variety of technical means.

As discussed in Sec. 3.5 , a home agency IdP has direct access to the home agency IdMS. This tight coupling allows the home agency IdP to be a highly trusted authority for the PIV identity account in question, including its current status and attributes. Not all use cases require a home agency IdP, but RPs can discover the home agency IdP for a given agency through the published home agency IdP record, as discussed in Sec. 3.5 .

A particularly important application of the home agency IdP stems from non-PKI-based derived PIV credentials. These credentials can only be verified by the home agency, as discussed in [SP800-157] . However, if the home agency provides an IdP that can verify such credentials, the cardholder can authenticate to RPs outside of the home agency while using the non-PKI-based derived PIV credential as their primary authenticator.