AC-4(7)

Requirement

Enforce one-way information flows through hardware-based flow control mechanisms.

Discussion

One-way flow mechanisms may also be referred to as a unidirectional network, unidirectional security gateway, or data diode. One-way flow mechanisms can be used to prevent data from being exported from a higher impact or classified domain or system while permitting data from a lower impact or unclassified domain or system to be imported.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Access control policy; information flow control policies; procedures addressing information flow enforcement; system design documentation; system configuration settings and associated documentation; system hardware mechanisms and associated configurations; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developers].

Test

[SELECT FROM: Hardware mechanisms implementing information flow enforcement policy].

ID	Assessment Objectives
AC-04(07)	one-way information flows are enforced through hardware-based flow control mechanisms.

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