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NIST SP 800-172 Enhanced CUI Protection Center

03.05.06E — Identity Proofing

Read the official CUI requirement and assessment content, then use the separately labeled Bare Metal Cyber perspective to connect it to implementation, evidence, and sustained operation.

1Source controls
5Assessment objectives
3Assessment methods

03.05 — Identification and Authentication · NIST SP 800-172 Revision 3

Active
Official NIST requirement content

Security requirement

  1. a.Identity proof users that require accounts for logical access to systems based on appropriate identity assurance level requirements as specified in applicable standards and guidelines.
  2. b.Resolve user identities to a unique individual.
  3. c.Collect, validate, and verify identity evidence.
Official NIST discussion

Discussion

Identity proofing is the process of collecting, validating, and verifying user identity information to establish credentials for accessing a system. Identity proofing is intended to mitigate threats to the registration of users and the establishment of their accounts. Resolving user identities ensure each user identity belongs to a unique individual. Organizations may be subject to laws, Executive Orders, directives, regulations, or policies that address the collection of identity evidence. An example of an applicable guideline that covers identity proofing is SP 800-63 .ADD REFERENCE. This requirement is sourced to a control tailored out of the SP 800-53B .13 moderate baseline in SP 800-171.

Official protection strategy classifications

Protection strategies supported

These classifications are carried from the official SP 800-172 OSCAL record and help explain the enhanced requirement’s defensive purpose.

PS-PRAPenetration-Resistant Architecture
Bare Metal Cyber interpretation

Implementation perspective

Treat Identity Proofing as an enhanced CUI protection outcome for elevated threat conditions that must be reflected in the system boundary, documented implementation, operational behavior, and assessment evidence. Pay particular attention to identity proofing, authentication strength, authenticator lifecycle, and resistance to credential compromise.

  1. Confirm the federal agency selected this enhanced requirement for the critical program or high-value asset and identify the CUI system components, services, users, and external connections in scope.
  2. Resolve every organization-defined parameter through an approved governance and tailoring process.
  3. Map each clause of the requirement to an accountable owner, implementation mechanism, and evidence source.
  4. Verify that inherited and shared implementations are supported by current provider evidence and responsibility boundaries.
  5. Collect evidence during normal operation and review changes, exceptions, and deficiencies on a risk-based cadence.

Questions to ask

  • Which critical-program or high-value-asset CUI, data flows, users, and services are protected by this enhanced requirement?
  • Which portions are implemented locally, inherited, shared, or not applicable, and what evidence supports that determination?
  • Do the system security plan, deployed configuration, operating process, and assessment evidence tell the same story?
  • What change, incident, or threshold should trigger reassessment?

Evidence and validation

  • identity proofing records
  • authenticator issuance and revocation logs
  • MFA and federation configuration
  • credential inventories and rotation evidence

Common failure patterns

  • MFA applied only to interactive users
  • service credentials without ownership or rotation
  • weak recovery paths that bypass strong authentication
  • federated trust not reviewed after partner changes
Official NIST SP 800-172A content

Assessment objectives and methods

Assessment objectives (5)
  1. a.

    users who require accounts for logical access to systems based on appropriate identity assurance level requirements as specified in applicable standards and guidelines are identity-proofed.

  2. b.

    user identities are resolved to a unique individual.

  3. c.

    identity evidence is collected.

  4. c.

    identity evidence is validated.

  5. c.

    identity evidence is verified.

Examine

  • Identification and authentication policy
  • procedures addressing identity proofing
  • system security plan
  • other relevant documents or records

Interview

  • Personnel with system operations responsibilities
  • personnel with information security responsibilities
  • system/network administrators
  • system developers
  • personnel with identification and authentication responsibilities

Test

  • Mechanisms supporting and/or implementing identification and authentication capabilities
Official source-control relationships

Source NIST SP 800-53 controls

These controls are referenced by the official SP 800-172 Rev. 3 OSCAL record. Open the corresponding control pages for complete control text, enhancements, D3FEND mappings, and related learning.

Source controlIA-12Open SP 800-53 control →
Source record

Authoritative sources

Bare Metal Cyber is an independent educational publisher and is not affiliated with or endorsed by NIST. The official publications, the responsible federal agency, and the governing contract or agreement determine applicability, tailoring, assessment depth, and required implementation.