Home › CMMC FAQs › CMMC Model
CMMC Model — Official DoD FAQ

Is Encrypted Controlled Unclassified Information (CUI) Still Considered CUI?

💼
Need help understanding CUI handling requirements? Schedule a consultation with Jun Cyber's CMMC experts.
Schedule Free Consultation
Official DoD Answer
Source Source: DoD CIO CMMC FAQs v5 (B-Q8)

In accordance with 32 CFR Part 2002, CUI remains controlled until it is formally decontrolled. As such, encrypted data that is CUI is still considered CUI. However, per NIST SP 800-88, cryptographic erase is acceptable for sanitization of controlled media before disposal or reuse.

In-Depth Analysis

Encryption Does Not Change CUI Status

This is one of the most commonly misunderstood aspects of CUI handling. Many contractors assume that encrypting CUI data "neutralizes" it — this is incorrect.

The Key Rule

CUI retains its controlled status regardless of whether it is encrypted, compressed, or otherwise transformed. The only way CUI loses its controlled status is through formal decontrol by an authorized authority.

Why This Matters for CMMC

  • Encrypted CUI in the cloud is still CUI — your cloud environment must meet CMMC scoping requirements
  • Encrypted CUI on removable media still requires proper media handling controls
  • Encrypted CUI in transit still counts toward your assessment scope
  • Encrypted backups containing CUI are still in-scope assets

The Exception: Cryptographic Erase

While encryption doesn't decontrol CUI, NIST SP 800-88 does allow cryptographic erasure as a valid sanitization method for media disposal. This means if you destroy the encryption keys following approved procedures, the media can be considered sanitized for disposal or reuse purposes.

Bottom line: Use encryption as a security control (it's required in many NIST 800-171 controls), but don't rely on it to reduce your CMMC scope.

Have More Questions?

ChatCMMC can answer detailed questions about CMMC compliance, NIST 800-171, assessment preparation, and more — with source citations when available from selected official DoD and NIST sources.

Ask ChatCMMC →

CMMC Readiness Assessment

Find out where your organization stands and what steps you need to take. Jun Cyber's CMMC experts can help you interpret the requirements.

By submitting, you agree to be contacted by Jun Cyber. No spam, ever.

Related Questions

You Might Also Want to Know

CMMC Model

What Is the Difference Between Federal Contract Information (FCI) and Controlled Unclassified Information (CUI)?

→ Scoping

Can Encryption Alone Create Logical Separation for CMMC?

→ Scoping

Are VDI Endpoints In Scope for CMMC Assessments?

→
Jun Cyber

Ready to Start Your CMMC Journey?

Jun Cyber helps defense contractors prepare for applicable CMMC requirements. From scoping and gap assessments to documentation, remediation, and C3PAO assessment readiness — Jun Cyber provides hands-on compliance support.

📅 Schedule a Consultation Learn About CMMC Select →