# Identifier Management (03.05.05)_identifier-management

> Receive authorization from organizational personnel or roles to assign an individual, group, role, service, or device identifier.

- Skill: `cyberstrikeus/identifier-management-03-05-05-identifier-management` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/identifier-management-03-05-05-identifier-management`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/identifier-management-03-05-05-identifier-management/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/identifier-management-03-05-05-identifier-management

---


# Identifier Management (03.05.05) Identifier Management

## High-Level Description

**Family:** Identification and Authentication
**Framework:** NIST SP 800-171 Rev 3
**Applicability:** Systems processing, storing, or transmitting CUI

Receive authorization from organizational personnel or roles to assign an individual, group, role, service, or device identifier.
Select and assign an identifier that identifies an individual, group, role, service, or device.
Prevent the reuse of identifiers for [organization-defined].
Manage individual identifiers by uniquely identifying each individual as [organization-defined].

## What to Check

- [ ] Verify Identifier Management (03.05.05) Identifier Management is implemented for CUI systems
- [ ] Review SSP documentation for Identifier Management (03.05.05)
- [ ] Validate CMMC Level 2 assessment objective for Identifier Management (03.05.05)
- [ ] Confirm POA&M addresses any gaps for Identifier Management (03.05.05)

## How to Test

### Step 1: Review System Security Plan

Examine the SSP for Identifier Management (03.05.05) implementation description and responsible parties.

### Step 2: Assess Implementation

```
# Verify security controls protecting CUI
# Check access controls, encryption, monitoring as applicable

# For Linux systems:
ls -la /etc/security/ 2>/dev/null
grep -r "CUI\|controlled" /etc/security/ 2>/dev/null

# For cloud:
# Use cloud-audit-mcp tools to assess posture
```

### Step 3: CMMC Assessment Validation

Verify this requirement passes CMMC Level 2 assessment methodology per SP 800-171A Rev 3.

## Tools

| Tool            | Purpose                      | Usage                  |
| --------------- | ---------------------------- | ---------------------- |
| cloud-audit-mcp | Assess cloud CUI environment | `cloud_audit_*` tools  |
| Manual Review   | SSP and POA&M review         | Documentation analysis |

## Remediation Guide

### Requirement Statement

Receive authorization from organizational personnel or roles to assign an individual, group, role, service, or device identifier.
Select and assign an identifier that identifies an individual, group, role, service, or device.
Prevent the reuse of identifiers for [organization-defined].
Manage individual identifiers by uniquely identifying each individual as [organization-defined].

### Supplemental Guidance

Identifiers are provided for users, processes acting on behalf of users, and devices. Prohibiting the reuse of identifiers prevents the assignment of previously used individual, group, role, service, or device identifiers to different individuals, groups, roles, services, or devices. Characteristics that identify the status of individuals include contractors, foreign nationals, and non-organizational users. Identifying the status of individuals by these characteristics provides information about the people with whom organizational personnel are communicating. For example, it is useful for an employee to know that one of the individuals on an email message is a contractor.

## Risk Assessment

| Finding                                                                | Severity | Impact                                             |
| ---------------------------------------------------------------------- | -------- | -------------------------------------------------- |
| Identifier Management (03.05.05) Identifier Management not implemented | High     | CUI Protection - Identification and Authentication |
| Identifier Management (03.05.05) partially implemented (POA&M)         | Medium   | CMMC certification risk                            |

## CWE Categories

| CWE ID  | Title                   |
| ------- | ----------------------- |
| CWE-287 | Improper Authentication |

## References

- [NIST SP 800-171 Rev 3](https://csrc.nist.gov/pubs/sp/800/171/r3/final)
- [NIST SP 800-171A Rev 3 (Assessment)](https://csrc.nist.gov/pubs/sp/800/171/a/r3/final)
- [CMMC Model Overview](https://www.acq.osd.mil/cmmc/)
- [NIST OSCAL Content](https://github.com/usnistgov/oscal-content)

## Checklist

- [ ] SSP documents Identifier Management (03.05.05) implementation
- [ ] Evidence of operating effectiveness collected
- [ ] POA&M addresses any gaps
- [ ] CMMC assessment objective met
- [ ] Continuous monitoring active