# NIST SP 800-53 Rev. 5 IA-12(6) — Accept Externally-Proofed Identities - Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-12-6-accept-externally-proofed-identities - Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-53 Rev. 5 Controls](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5) › IA — Identification and Authentication - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-53 Rev. 5**·Control `IA-12(6)`·medium·Component: **Identification and Authentication** ## What this control requires > Accepting externally-proofed identities at an organization-defined identity assurance level, consistent with security policies, to limit re-proofing and support federated identity management across agencies and organizations. This control supports the Federate Identity Management System capability within the Identification and Authentication family. > > — NIST SP 800-53 Rev. 5, Control IA-12(6) ### In plain English Accepting externally-proofed identities at an organization-defined identity assurance level, consistent with security policies, to limit re-proofing and support federated identity management across agencies and organizations. In practice, this means you can prove you policy management-level controls on a defined cadence. ## Why it matters SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed. ## What an auditor looks for A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan. Within **Identification and Authentication**, the assessor will trace your implementation back to the catalogue reference (Control IA-12(6)) and look for objective evidence on the latest two assessment cycles. ## How to implement #### Policy Management **Docs.** Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA. ### Operational checklist - **Policy.** Document the trigger, the owner and the cadence. - **Security.** Document the trigger, the owner and the cadence. - **Consistent.** Document the trigger, the owner and the cadence. - **Authentication.** Document the trigger, the owner and the cadence. - **Limit.** Document the trigger, the owner and the cadence. - **Scope:** management, authentication, organization, system, identity, capability, organizations, identification. ## Evidence to collect - **Policy Document.** A signed and version-controlled policy / standard / procedure document. Signed policy or standard documents the safeguard. Focus: Accept Externally-Proofed Identities. ## Common pitfalls - Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced. ## How it maps to other frameworks Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit. - [**HIPAA (45 CFR Part 164) 164.312(d)** — Person or Entity Authentication](https://support.icompaas.com/compliance/hipaa/164-312-d-person-or-entity-authentication) - [**NIST SP 800-171 Rev. 3 3.5.11** — Authentication Feedback](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-5-11-authentication-feedback) - [**ISO/IEC 27001:2022 A.5.17** — Authentication information](https://support.icompaas.com/compliance/iso-27001-2022/a-5-17-authentication-information) - [**BSI C5:2020 SP-01** — Documentation, communication and provision of policies and instructions](https://support.icompaas.com/compliance/bsi-c5-2020/sp-01-documentation-communication-and-provision-of-policies-and-instructions) ## Related controls in NIST SP 800-53 Rev. 5 - [**Control IA-8(4)** — Use Of Defined Profiles](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-8-4-use-of-defined-profiles) - [**Control IA-1** — Policy And Procedures](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-1-policy-and-procedures) - [**Control IA-2(13)** — Out-Of-Band Authentication](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-2-13-out-of-band-authentication) - [**Control IA-4(9)** — Attribute Maintenance And Protection](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-4-9-attribute-maintenance-and-protection) - [**Control IA-6** — Authentication Feedback](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-6-authentication-feedback) - [**Control IA-5(15)** — Gsa-Approved Products And Services](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ia-5-15-gsa-approved-products-and-services) ## References - [NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5](https://csrc.nist.gov/Projects/risk-management/sp800-53-controls) - Catalogue identifier: `Control IA-12(6)` Topics: governance riskidentity managementpolicy management ## Related compliance guidance - [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): Start with the full NIST SP 800-53 implementation guide — scope, roadmap, evidence and how the assessment runs. - [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): If your obligation is protecting CUI in your own systems for a federal or defence contract, this derived subset — not the full catalogue — is the requirement. - [SOC 2 compliance: a practical implementation guide for cloud-native SaaS teams](https://support.icompaas.com/compliance/soc-2-trust-services-criteria): Most commercial SaaS already hold a SOC 2 Type 2, and FedRAMP 20x Class A is designed for providers that have one.