IA-4(8)_pairwise-pseudonymous-identifiers

DevOps & Security

Generate pairwise pseudonymous identifiers.

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/IA_identification-and-authentication/IA-4(8)_pairwise-pseudonymous-identifiers/SKILL.md

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IA-4(8) Pairwise Pseudonymous Identifiers

Enhancement of: IA-4

High-Level Description

Family: Identification and Authentication (IA) Framework: NIST SP 800-53 Rev 5

A pairwise pseudonymous identifier is an opaque unguessable subscriber identifier generated by an identity provider for use at a specific individual relying party. Generating distinct pairwise pseudonymous identifiers with no identifying information about a subscriber discourages subscriber activity tracking and profiling beyond the operational requirements established by an organization. The pairwise pseudonymous identifiers are unique to each relying party except in situations where relying parties can show a demonstrable relationship justifying an operational need for correlation, or all parties consent to being correlated in such a manner.

What to Check

Verify IA-4(8) Pairwise Pseudonymous Identifiers is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for IA-4(8)
Verify enhancement builds upon base control IA-4

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for IA-4(8) 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 authentication settings	`cloud_audit_iam_policies`
hackbrowser-mcp	Test authentication mechanisms	`browser_auth_test`

Remediation Guide

Control Statement

Generate pairwise pseudonymous identifiers.

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
IA-4(8) Pairwise Pseudonymous Identifiers not implemented	High	Identification and Authentication
IA-4(8) partially implemented	Medium	Incomplete Identification and Authentication

CWE Categories

CWE ID	Title
CWE-287	Improper Authentication

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (IA-5) reviewed