N12 Reference Point (AMF to AUSF)

Also known as: N12 reference point, N12 interface

N12 is the 3GPP service-based reference point between the AMF and the AUSF, used during primary authentication to request authentication vectors and confirm authentication results (Nausf_UEAuthentication). Compromise of N12 breaks the trust chain of 5G-AKA and EAP-AKA', so it is protected with mutual TLS and OAuth 2.0 tokens per 3GPP TS 33.501.

Categories: Core NetworkSecurity ControlsProtocols and Standards

N12 in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

Security controls span signaling firewalls (SS7/Diameter/GTP screening), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36.

To place N12 in the wider telecom-security picture, review N8, EAP-AKA′, SEAF, N11, N3IWF and Network Slice: each entry cross-references back to this page so you can walk the topic in either direction.

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