PRINS (PRotocol for N32 INterconnect Security)

Also known as: Protocol for N32 Interconnect Security

PRINS is the 3GPP application-layer security protocol defined in TS 33.501 for the N32-f interface. It applies JSON-based JOSE protection (JWS for integrity, JWE for confidentiality) on a per-information-element basis so that IPX intermediaries can perform legitimate value-added services on selected fields while the SEPPs at each end still authenticate the message and detect any unauthorised modification.

Categories: SignalingRoaming and InterconnectProtocols and Standards

PRINS in context

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.

Roaming and interconnect are where two operators, often with an IPX or GRX carrier in between, exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place PRINS in the wider telecom-security picture, review N32-f, Interconnect Security Model, Inter-PLMN Security, SEPP Security, Diameter Interconnect Security and Integrity.

Related terms

Equipment

SEPP and 5G interconnect (N32, PRINS)

Articles in the P1 mobile network security guide

Related topic hubs

  • SEPP Security N32-c/N32-f, PRINS, JWE and OAuth 2.0 at the 5G roaming edge.
  • Roaming Security IPX/GRX interconnect risk, home-routed vs local-breakout, SEPP.
  • 5G Security 5G SBA, SEPP, SUCI, 5G-AKA, N32 and service-based interface security.
  • GTP Security GTP-C/GTP-U threats across S5/S8, N3/N9 and GRX/IPX borders under GSMA FS.20.

More from the TelcoSec Glossary

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