3.5.5

Discussion

Identifiers are provided for users, processes acting on behalf of users, or devices (3.5.1). Preventing reuse of identifiers implies preventing the assignment of previously used individual, group, role, or device identifiers to different individuals, groups, roles, or devices.

NIST 800-171A Assessment Guidance

Examine

[SELECT FROM: Identification and authentication policy; procedures addressing identifier management; procedures addressing account management; security plan; system design documentation; system configuration settings and associated documentation; list of system accounts; list of identifiers generated from physical access control devices; other relevant documents or records].
Interview

[SELECT FROM: Personnel with identifier management responsibilities; personnel with information security responsibilities; system or network administrators; system developers].
Test

[SELECT FROM: Mechanisms supporting or implementing identifier management].

ID	Assessment Objectives
3.5.5[a]	A period within which identifiers cannot be reused is defined.
3.5.5[b]	Reuse of identifiers is prevented within the defined period.

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