SUPI Protection

Technical Explanation

The Subscription Permanent Identifier (SUPI) is the crown jewel of mobile identity, uniquely identifying a subscriber worldwide. SUPI Protection enforces strict architectural isolation: the plaintext SUPI is stored exclusively inside hardware security modules (HSMs) within the home network's Quantum-Safe UDM. All other core network functions (AMF, SMF, PCF, and base stations) operate exclusively using temporary pseudonyms (5G-GUTI evolution), ensuring the SUPI is never leaked.

Key Functions

• Strict hardware-enforced isolation ensuring plaintext SUPI never leaves the secure UDM
• Operating all external network functions and base stations using dynamic pseudonyms
• Preventing permanent subscriber identity correlation across distinct network slices
• Audited access control logging every administrative query targeting subscriber records
• Adherence to international data privacy mandates prohibiting persistent device tracking