AC-4(4) Flow Control of Encrypted Information
Control enhancement of AC-4 Information Flow Enforcement
Control
Prevent encrypted information from bypassing [Assignment: information flow control mechanisms] by [Assignment: Selection (one-or-more): decrypting the information | blocking the flow of the encrypted information | terminating communications sessions attempting to pass encrypted information | [ac-04.04_odp.03] ].
Discussion
Flow control mechanisms include content checking, security policy filters, and data type identifiers. The term encryption is extended to cover encoded data not recognized by filtering mechanisms.
Related controls
Need AC-4(4) implemented and evidenced?
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Control catalog and framework text on this page is reproduced from official NIST publications — a public-domain work of the U.S. Government (17 U.S.C. §105). Maverc commentary, groupings, and readiness guidance are our own and are not part of any NIST publication.