3 ms·
Which networks are doing that though? I remember so many talks about security issues because of outdated protocols.
by aw3c2 8y ago
Which networks are doing that though? I remember so many talks about security issues because of outdated protocols.
- tonyarkles 8y agoI'm not positive on this, but I'm pretty sure it's mandatory in LTE. When you first register you send your IMSI (in the clear...) and they return a TMSI for you. My quick skim through the code looks like it'll track that too though: # Register IMSI as seen if a TMSI believed to # belong to the IMSI is seen.
- dogma1138 8y agoAll UMTS networks or newer use TMSI the actual IMSI is only sent once per baseband reset as long as there wasn’t a period where a hand off between VLRs didn’t occur and you didn’t roam to another network without direct peering. That said there is a trick to bypass TMSI for tracking as you can trigger an IMSI re-registration by interrupting mobile data or by forcing the mobile phone to downgrade through jamming. Also TMSI only prevents tracking not eavesdropping, it makes targeted eavesdropping harder but not impossible if you can track the target through other means.
- dfox 8y agoEvery network built on 3GPP protocol stack (including 90's 2G GSM) does that, because it is inherent feature of how GSM signalling protocols work.