# SC-12(6)_physical-control-of-keys

> Maintain physical control of cryptographic keys when stored information is encrypted by external service providers.

- Skill: `cyberstrikeus/sc-12-6-physical-control-of-keys` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/sc-12-6-physical-control-of-keys`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/sc-12-6-physical-control-of-keys/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/sc-12-6-physical-control-of-keys

---


# SC-12(6) Physical Control of Keys

> **Enhancement of:** SC-12

## High-Level Description

**Family:** System and Communications Protection (SC)
**Framework:** NIST SP 800-53 Rev 5

For organizations that use external service providers (e.g., cloud service or data center providers), physical control of cryptographic keys provides additional assurance that information stored by such external providers is not subject to unauthorized disclosure or modification.

## What to Check

- [ ] Verify SC-12(6) Physical Control of Keys is documented in SSP
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for SC-12(6)
- [ ] Verify enhancement builds upon base control SC-12

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SC-12(6) 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                                |
| --------------- | ------------------------------------- | ------------------------------------ |
| cloud-audit-mcp | Check encryption and network controls | `cloud_audit_encryption`             |
| nmap            | Network scanning                      | `nmap -sV --script ssl-enum-ciphers` |

## Remediation Guide

### Control Statement

Maintain physical control of cryptographic keys when stored information is encrypted by external service providers.

### Implementation Guidance

For organizations that use external service providers (e.g., cloud service or data center providers), physical control of cryptographic keys provides additional assurance that information stored by such external providers is not subject to unauthorized disclosure or modification.

## Risk Assessment

| Finding                                           | Severity | Impact                                          |
| ------------------------------------------------- | -------- | ----------------------------------------------- |
| SC-12(6) Physical Control of Keys not implemented | High     | System and Communications Protection            |
| SC-12(6) partially implemented                    | Medium   | Incomplete System and Communications Protection |

## CWE Categories

| CWE ID  | Title                                |
| ------- | ------------------------------------ |
| CWE-311 | Missing Encryption of Sensitive Data |

## References

- [NIST SP 800-53 Rev 5 - SC-12(6)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=sc-12.6)
- [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 (none) reviewed