What the AUSF does
The AUSF supports authentication procedures for users accessing the 5G System. It works with the AMF and subscriber-data functions during primary authentication.
Why it matters to slicing
A slice does not bypass normal subscriber authentication. Access to a differentiated service still depends on trusted identity, subscription and network authorisation.
Security boundary
Authentication is only one part of security. Slice isolation, application authentication, encryption and operational controls remain separate requirements.
Standards note: this page is an explanatory summary. Precise procedures, services and information elements are defined in the applicable 3GPP specifications.