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The regular attach procedure is unchanged. In the simplest version we give every SIM the identical IMSI and key. However, their use is to only gain IP connecti
by prschmitt 5y ago
The regular attach procedure is unchanged. In the simplest version we give every SIM the identical IMSI and key.
However, their use is to only gain IP connectivity - the equivalent of an allow list on the backend db (AUSF) which gives you IP connectivity. At that point you do billing and auth at the PGPP-GW using oblivious auth tokens.
- red0point 5y agoThanks! You mention that this is the simplest version, is there one where you use distinct keys? Also, regarding the IMEI - let‘s assume the UE nullified it, how would you distinguish between a legitimately nullified UE and a stolen UE that had its IMEI nullified?