# PS-3(1)_classified-information

> Verify that individuals accessing a system processing, storing, or transmitting classified information are cleared and indoctrinated to the highest cl

- Skill: `cyberstrikeus/ps-3-1-classified-information` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/ps-3-1-classified-information`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/ps-3-1-classified-information/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/ps-3-1-classified-information

---


# PS-3(1) Classified Information

> **Enhancement of:** PS-3

## High-Level Description

**Family:** Personnel Security (PS)
**Framework:** NIST SP 800-53 Rev 5

Classified information is the most sensitive information that the Federal Government processes, stores, or transmits. It is imperative that individuals have the requisite security clearances and system access authorizations prior to gaining access to such information. Access authorizations are enforced by system access controls (see [AC-3](#ac-3) ) and flow controls (see [AC-4](#ac-4)).

## What to Check

- [ ] Verify PS-3(1) Classified Information is documented in SSP
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for PS-3(1)
- [ ] Verify enhancement builds upon base control PS-3

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for PS-3(1) implementation details. Verify the organization has documented how this control is satisfied.

### Step 2: Validate Implementation

```
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null
```

### Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

## Tools

| Tool          | Purpose                           | Usage |
| ------------- | --------------------------------- | ----- |
| Manual Review | Documentation and interview-based | N/A   |

## Remediation Guide

### Control Statement

Verify that individuals accessing a system processing, storing, or transmitting classified information are cleared and indoctrinated to the highest classification level of the information to which they have access on the system.

### Implementation Guidance

Classified information is the most sensitive information that the Federal Government processes, stores, or transmits. It is imperative that individuals have the requisite security clearances and system access authorizations prior to gaining access to such information. Access authorizations are enforced by system access controls (see [AC-3](#ac-3) ) and flow controls (see [AC-4](#ac-4)).

## Risk Assessment

| Finding                                        | Severity | Impact                        |
| ---------------------------------------------- | -------- | ----------------------------- |
| PS-3(1) Classified Information not implemented | Medium   | Personnel Security            |
| PS-3(1) partially implemented                  | Low      | Incomplete Personnel Security |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - PS-3(1)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=ps-3.1)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (AC-3, AC-4) reviewed