# NIST800 53 PS-3(1) — Classified Information

- Source: https://support.icompaas.com/support/solutions/articles/a_gen_nist80053_ps31_004028b2ee-nist800-53-ps-31-classified-information
- Section: [Solutions](https://support.icompaas.com/support/solutions) › [NIST](https://support.icompaas.com/support/solutions/62000112528) › [Personnel Security](https://support.icompaas.com/support/solutions/folders/f_gen_62000112528_personnelsecurity)
- Last updated: 2026-05-30
- Publisher: iCompaas, Inc. (https://www.icompaas.com)

NIST800 53 · Control PS-3(1) · Priority: critical · Component: Personnel Security

### What this control covers

Ensure that individuals accessing systems processing, storing, or transmitting classified information are cleared and indoctrinated to the highest classification level of the information they have access to. Classified information requires the highest level of clearance, which must be verified prior to granting access. Access is controlled through system access controls and flow controls. This control supports the Governance capability within the Personnel Security family.

### Why it matters

Risk is the language an executive team understands; this control connects technical reality to board-level decisions and budget allocation.

### How to implement

#### AWS

Codify the policy intent as **SCPs, AWS Config conformance packs, and Security Hub standards** so the cloud enforces what the document says.

#### Azure

Codify in **Azure Policy initiatives** (built-in regulatory compliance for CIS, ISO 27001, SOC 2, HIPAA) and assign at management-group level.

#### On-premises

Maintain a policy library with a documented review cadence (annual minimum); store in your GRC tool with attestation tracking. Map each policy to controls so an audit pull cites the exact policy clause.

### Evidence to collect

-   `policy_document` — A signed, version-controlled policy stating leadership intent and the named owner.

Signed policy or standard documents the safeguard. Focus: Classified Information.

### Quick checklist

-   Policy — Management / Information
-   Access — Management / Information
-   Information — Management / Information
-   Security — Management / Information
-   System — Management / Information
-   Control — Management / Information

### Related articles on this site

-   [CMMC 2.0 PE.1.131 Limit physical access to organizational information systems, equipment, and the respective operating environments to authorized individuals.](https://support.icompaas.com/support/solutions/articles/62000229653-cmmc-2-0-pe-1-131-limit-physical-access-to-organizational-information-systems-equipment-and-the-res)
-   [Ensure IAM password policy requires at least one uppercase letter](https://support.icompaas.com/support/solutions/articles/62000080729-ensure-iam-password-policy-requires-at-least-one-uppercase-letter)
-   [Ensure IAM password policy require at least one lowercase letter](https://support.icompaas.com/support/solutions/articles/62000080758-ensure-iam-password-policy-require-at-least-one-lowercase-letter)
-   [Ensure IAM password policy require at least one symbol](https://support.icompaas.com/support/solutions/articles/62000080773-ensure-iam-password-policy-require-at-least-one-symbol)

## 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): How the 800-53 catalogue, baselines and the Risk Management Framework fit together, and which controls take the most work in the cloud.
- [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 the driver is a DoD or federal contract handling CUI, 800-171 (and CMMC) is the scope you actually need.