IA-4(1)

Requirement

Prohibit the use of system account identifiers that are the same as public identifiers for individual accounts.

Discussion

Prohibiting account identifiers as public identifiers applies to any publicly disclosed account identifier used for communication such as, electronic mail and instant messaging. Prohibiting the use of systems account identifiers that are the same as some public identifier, such as the individual identifier section of an electronic mail address, makes it more difficult for adversaries to guess user identifiers. Prohibiting account identifiers as public identifiers without the implementation of other supporting controls only complicates guessing of identifiers. Additional protections are required for authenticators and credentials to protect the account.

Title

Identifier Management | Prohibit Account Identifiers as Public Identifiers
Family

Identification and Authentication
NIST 800-53B Baseline(s)

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Identification and authentication policy; system security plan; procedures addressing identifier management; procedures addressing account management; system design documentation; system configuration settings and associated documentation; system audit records; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with identifier management responsibilities; organizational personnel with information security responsibilities; system/network administrators].

Test

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

ID	Assessment Objectives
IA-04(01)	the use of system account identifiers that are the same as public identifiers is prohibited for individual accounts.

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