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AC-04(04) Flow Control of Encrypted Information

NIST SP 800-53 (controls) 5.1.1+u4
All changes in this version
first version loaded AC High baseline part of AC-4

Title

Flow Control of Encrypted Information

Control

Prevent encrypted information from bypassing [Assignment: information flow control mechanisms] by [Selection (one or more): decrypting the information; blocking the flow of the encrypted information; terminating communications sessions attempting to pass encrypted information; {{ insert: param, 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.

Parameters

ac-04.04_odp.01: information flow control mechanisms
ac-04.04_odp.02: [decrypting the information; blocking the flow of the encrypted information; terminating communications sessions attempting to pass encrypted information; {{ insert: param, ac-04.04_odp.03 }} ]
ac-04.04_odp.03: organization-defined procedure or method

Related controls

si-4

Assessment objective

AC-04(04) encrypted information is prevented from bypassing [Assignment: information flow control mechanisms] by [Selection (one or more): decrypting the information; blocking the flow of the encrypted information; terminating communications sessions attempting to pass encrypted information; {{ insert: param, ac-04.04_odp.03 }} ].

STIG rules that implement this control 0

No followed STIG rule cites a CCI indexed to this control (CCI list 2026-07-14).