GBA (Generic Bootstrapping Architecture)

Also known as: Generic Bootstrapping Architecture

GBA is a 3GPP framework (TS 33.220) that reuses the USIM's AKA credentials to bootstrap application-layer keys between the UE and a Network Application Function, without provisioning a separate secret per service. The BSF runs AKA with the HSS, then derives a Ks that both the UE and the NAF can use, enabling authenticated services such as MBMS key management, IMS single sign-on and 3GPP-based OTT authentication.

Categories: Identity and SubscriberSecurity ControlsProtocols and Standards

GBA in context

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) anchor authentication, charging and lawful interception. Any protocol that leaks a permanent identifier is treated as a privacy defect, which is why 5G introduced SUCI concealment on the air interface.

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 GBA in the wider telecom-security picture, review CAP, USIM, SM-DP+, Key Management, OASIS and VPN: each entry cross-references back to this page so you can walk the topic in either direction.

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