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Controls / System and Communications Protection / 3.13.11
3.13.11
SC.L2-3.13.11 · Level 2

Employ FIPS-validated cryptography when used to protect the confidentiality of CUI.

NIST SP 800-171 Rev 2 · §3.13.11

Employ FIPS-validated cryptography when used to protect the confidentiality of CUI.

Assessment objectives

From NIST SP 800-171A · 1 objective must be met to satisfy this control
3.13.11[a] Employ FIPS-validated cryptography when used to protect the confidentiality of CUI.
Examine
[SELECT FROM: System and communications protection policy; procedures addressing cryptographic protection; security plan; system design documentation; system configuration settings and associated documentation; cryptographic module validation certificates; list of FIPS-validated cryptographic modules; system audit logs and records; other relevant documents or records].
Interview
[SELECT FROM: System or network administrators; personnel with information security responsibilities; system developer; personnel with responsibilities for cryptographic protection].
Test
[SELECT FROM: Mechanisms supporting or implementing cryptographic protection].

What we look for in practice

The following are placeholder notes that should be refined based on practice experience.

What assessors look for in practice. Documented evidence that this control is implemented across all CUI-handling systems within scope. Specific artifacts vary, but expect requests for written procedures, system configurations, and operational records demonstrating the control is active.

Common failure patterns. Typical issues include incomplete documentation, inconsistent implementation across systems, and missing periodic review records. Refine this section as your practice accumulates direct assessment experience.

Strong evidence looks like. Formal policy referencing this control, technical configurations demonstrating enforcement, periodic review logs with sign-off, and procedures for handling exceptions.

Scoring and POA&M context. 5-point control under the DoD Assessment Methodology. Highest scoring impact — treat as a foundational requirement. POA&M-eligible — deferral up to 180 days is allowed under conditional certification per 32 CFR 170.21.