TLDR
The 5G core network is a complete transformation in itself as compared to legacy 4G networks in terms of security. Security is blended into the architecture, call flows and procedures in a highly distributed fashion with no single point of failure. The Foundations of 5G Security include NAS Security and the SUCI encryption of the Subscription Permanent Identifier (SUPI), which can be done either in the mobile device or in the SIM itself (which is under operator control) The primary authentication mechanism has in-built home control allowing the home operator to know whether the device is authenticated in a given network.via the TL;DR App
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