Zero Trust (Telecom)

In telecommunications, Zero Trust is a security model that assumes no implicit trust between network functions, sites, or peers, and requires continuous verification of identity, posture, and authorization for every interaction. Applied to 5G, it includes mutual TLS between NFs, OAuth2 token validation at the NRF and producer NFs, strict slice isolation, and granular OAM access control.

Categories: Radio Access NetworkCore NetworkIdentity and Subscriber

Zero Trust (Telecom) in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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.

To place Zero Trust (Telecom) in the wider telecom-security picture, review UPF, N1, Encryption, HTTP, IAMF and Inter-Network Function Authentication.

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More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.