Two weird LTE auth questions that I'm sure someone here knows:
1) My understanding is that the mutual auth means relying on a SIM private key. But can't phones without SIMs get onto networks for emergency calls? Or can that be done without full authentication?
2) Is there anything at the protocol level stopping multiple identical SIMs joining the same network (private, unfederated) network? Multiple devices with different IMEIs but the same IMSI and cryptographic material
@Aissen @kleinweby @mjg59 That used to be the default in GSM specs. However too much idiots then used calling 112 to test a phone without SIM whether it's working, so has been disabled in at least germany.
However you can still use other networks than your home network for 112, you just need to have a working SIM.
2) It might be possible. Paging must never use the IMSI and always S-TMSI.
Also higher up the stack there are constrains you will break. But if you only want to have many phones with the same IMSI in your single cell, I would try to look into srsEPC first. I don't know the code base of srsEPC, but it is a single daemon instead of 10 daemons.
Such constrains for e.g. a IMSI is often a unique id in internal structure to save phone capabilities. (auth, crypto, ...)
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