name: SEAF
full_form: Security Anchor Function
context: Abusing terminology, the term MMF is used here to refer to the non-SEAF role part of the AMF. Now from the UE perspective, an AMF could endorse the role of the SEAF, the role of the MMF or both. In Variant 1, when the UE authenticates first with a particular AMF, that AMF endorses both roles. Such an AMF will be henceforth referred to as the SEAF AMF (or SEAF for short). When the UE later moves to another AMF (e.g. in case of a mobility event), the target AMF endorses only the role of the MMF while the old AMF keeps the role of the SEAF but not the MMF. If a UE is re-authenticated by other than SEAF AMF, then the new AMF becomes the SEAF and a new KSEAF is taken into use. By comparison to Variant 2, in variant 1 the SEAF is selected in an Ad hoc manner (or self declared). In Variant 2, a designated fixed AMF endorses the role of the SEAF regardless of which AMF ends up serving the UE. Since it is the SEAF that authenticates the UE, this leads to two subcases. Both variants involve an
description: The Security Anchor Function (SEAF) is a network function responsible for authenticating user equipment (UE) and managing security-related tasks within the 5G core network.
explanation: SEAF is classified as a Network Function because it performs specific functions within the 5G network, including authentication and security management, as defined in 3GPP standards.
section_title: 5.1.4.36.2.2	Role assignment
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