3GPP TS 33.501 (5G System Security Architecture)

In telecommunications, 3GPP TS 33.501 defines the security architecture and procedures of the 5G System, including primary authentication (5G-AKA, EAP-AKA'), key hierarchy, SUCI concealment of the subscriber identifier, NF-to-NF authentication and authorization in the SBA, and security on the N32 inter-PLMN interface. It is the foundational normative reference for 5G security.

Categories: Core NetworkSignalingRoaming and Interconnect

3GPP TS 33.501 in context

The mobile core is where subscriber sessions, mobility and policy live. 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. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

To place 3GPP TS 33.501 in the wider telecom-security picture, review FS.07, HLR, MAP Security, SEPP, Defense in Depth and MSSP.

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