The same explanations we use in class - free to read, no signup.
A SUCI hides who's asking. It doesn't prove they're telling the truth, and it doesn't stop a fake base station answering back. That's a separate exchange — SEAF, AUSF, and the five shapes an Authentication Vector can take.
In 4G your phone shouted its permanent identity across the air, and anyone with cheap radio kit could write it down. SUCI is the fix - what it conceals, what it deliberately does not, and how to check yours is actually switched on.
A practical walkthrough of the messages in a PDU session establishment, in the order you will see them, with the fields that actually matter.
The 5G core gives every network function four different identifiers. Here is what each one is for, and why Set and Region exist at all.
