MP.L2-3.8.6 · Level 2

Implement cryptographic mechanisms to protect the confidentiality of CUI stored on digital media…

NIST SP 800-171 Rev 2 · §3.8.6

Implement cryptographic mechanisms to protect the confidentiality of CUI stored on digital media during transport unless otherwise protected by alternative physical safeguards.

Assessment objectives

From NIST SP 800-171A · 1 objective must be met to satisfy this control

3.8.6[a] Implement cryptographic mechanisms to protect the confidentiality of CUI stored on digital media during transport unless otherwise protected by alternative physical safeguards.

Examine

[SELECT FROM: System media protection policy; procedures addressing media transport; system design documentation; security plan; system configuration settings and associated documentation; system media transport records; system audit logs and records; other relevant documents or records].

Interview

[SELECT FROM: Personnel with system media transport responsibilities; personnel with information security responsibilities].

Test

[SELECT FROM: Cryptographic mechanisms protecting information on digital media during transportation outside controlled areas].

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. 1-point control under the DoD Assessment Methodology. Lower scoring impact, but still required for full compliance. POA&M-eligible — deferral up to 180 days is allowed under conditional certification per 32 CFR 170.21.