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3.3.3.2 Selecting Initial AAL

NIST PIV and digital identity SP 800-63-4 against SP 800-63-3
All changes in this version
added 3 Digital Identity Risk Management part of 3.3.3

Title changed

Before · SP 800-63-3

After · SP 800-63-4

Selecting Initial AAL

Control changed

Before · SP 800-63-3

After · SP 800-63-4

Authentication is needed for online services that offer access to personal information, protected information, or subscriber accounts. Organizations should consider the legal, regulatory, or policy requirements that govern online services when making decisions regarding the application of authentication assurance levels and authentication mechanisms. For example, [EO13681] states that “all organizations making personal data accessible to citizens through digital applications require the use of multiple factors of authentication,” which requires a minimum selection of AAL2 for applications that meet those criteria.

If the online service requires authentication to be implemented, an initial AAL is selected through a simple mapping process:

• Low impact: AAL1

• Moderate impact: AAL2

• High impact: AAL3

The organization SHALL document whether authentication is needed for their online service and, if it is, SHALL select an initial AAL for each user group based on the effective impact level determination from Sec. 3.2.4 .

The AAL reflects the level of assurance that the claimant is the same individual to whom the authenticator was registered. The initial selection assumes that higher potential impacts of failures in the authentication process should be mitigated by higher assurance processes.