README.md: SIM must not perform IMSI detach

This commit is contained in:
Oliver Smith 2020-03-31 12:21:06 +02:00
parent c4206534f9
commit 1acc89b8fc
1 changed files with 5 additions and 0 deletions

View File

@ -89,6 +89,11 @@ it overwrites the IMSI with the next pseudo IMSI and invalidates the TMSI and
Kc. The applet triggers a refresh, which causes the SIM to do a new Location
Update with the new IMSI.
It is important, that the SIM does not invoke the IMSI detach procedure (TS
04.08 Section 4.3.4). This is controlled by the network. Otherwise it becomes
trivial to correlate the detach of the old IMSI with the attach or Location
Update of the new IMSI.
## Notes
### What if the SMS gets lost?