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3.4.1.1 General Requirements

NIST PIV and digital identity SP 800-63C-4 against SP 800-63C
All changes in this version
added 3 Common Federation Requirements part of 3.4.1

Title changed

Before · SP 800-63C

After · SP 800-63C-4

General Requirements

Control changed

Before · SP 800-63C

After · SP 800-63C-4

When using pairwise pseudonymous identifiers within the assertions generated by the IdP for the RP, the IdP SHALL generate a different federated identifier for each RP (see Sec. 3.4.1.2 ) or set of RPs (see Sec. 3.4.1.3 ).

Some identity attributes such as names, physical addresses, phone numbers, email addresses, and others can be used to identify a subscriber outside of a federation transaction. When PPIs are used alongside these kinds of identifying attributes, it may still be possible for multiple colluding RPs to re-identify a subscriber by correlation across systems. For example, if two independent RPs each see the same subscriber identified with a different PPI, the RPs could still determine that the subscriber is the same person by comparing the name, email address, physical address, or other identifying attributes carried alongside the PPI in the respective assertions. If PPIs are used alongside identifying attributes, RPs SHALL establish privacy policies, processes, and procedures to prevent the correlation of subscriber data consistent with applicable legal and regulatory requirements.

In a proxied federation model (see Sec. 3.3.3 ), the upstream IdP may not be able to generate a PPI for the downstream RP, since the proxy could blind the IdP from knowing which RP is being accessed by the subscriber. In such situations, the PPI is generally established between the IdP and the federation proxy. Acting as an IdP, the proxy can provide a PPI to the downstream RP. Depending on the protocol, the federation proxy may need to map the PPI back to the associated identifiers from upstream IdPs in order to allow the identity protocol to function. In such cases, the proxy will be able to track and determine which PPIs represent the same subscriber at different RPs. The mapping of a PPI to other identifiers is considered subscriber information and SHALL be treated in accordance with the requirements in Sec. 3.10.1 .