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Scoping — Official DoD FAQ

Can Encryption Alone Create Logical Separation for CMMC?

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Official DoD Answer
Source Source: DoD CIO CMMC FAQs v5 (F-Q3)

No. Logical separation occurs when data transfer between physically connected assets is prevented by non-physical means such as software or network assets (e.g., firewalls, routers, VPNs, VLANs). While properly implemented encryption provides necessary confidentiality protection, it does not, by itself, prevent data transfer or enforce the security boundary of a network.

In-Depth Analysis

Encryption ≠ Logical Separation

This is a critical distinction that affects how you scope your CMMC assessment boundary. Encryption protects data confidentiality, but it does not create network separation.

What Creates Logical Separation

Logical separation requires controls that prevent data transfer between network segments:

  • Firewalls: With properly configured rules restricting traffic
  • Routers/switches: With ACLs and VLAN configurations
  • VPNs: Creating isolated tunnels within shared infrastructure
  • VLANs: Segmenting traffic at the data link layer
  • Software-defined networking: Microsegmentation

Why Encryption Isn't Enough

Encryption protects the content of data but doesn't prevent:

  • Data from being transferred to unauthorized systems
  • Unauthorized users from accessing the network segment
  • Traffic analysis or metadata exposure
  • Data exfiltration of the encrypted payload

The Right Approach

Use encryption in combination with logical separation controls. Encrypt CUI in transit and at rest (required by multiple NIST 800-171 controls), AND implement network segmentation to define your CMMC assessment boundary. Don't try to use one control to replace the other.

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