AC-11(1)

Requirement

Conceal, via the device lock, information previously visible on the display with a publicly viewable image.

Discussion

The pattern-hiding display can include static or dynamic images, such as patterns used with screen savers, photographic images, solid colors, clock, battery life indicator, or a blank screen with the caveat that controlled unclassified information is not displayed.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Access control policy; procedures addressing session lock; display screen with session lock activated; system design documentation; system configuration settings and associated documentation; system security plan; other relevant documents or records].

Interview

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

ID	Assessment Objectives
AC-11(01)	information previously visible on the display is concealed, via device lock, with a publicly viewable image.

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