Cellular Network Infrastructure » IMSI Pseudonymization

02/26/2020

03:06 PM Feature #4400: Approach C: HLR decides and sends the entire next pseudo IMSI to SIM

Updated the README, that describes the whole process, with all the feedback above:
https://gerrit.osmocom.org/plug... osmith

02:31 PM Revision 0ee12879 (imsi-pseudo): README.md: use headlines

osmith

02:20 PM Revision 5e62dbac (imsi-pseudo): docs: update to feedback from Neels

Most importantly, there is no ACK SMS anymore, because the next LU is
the implicit ACK. While at it, I've filled in t... osmith

12:38 PM Bug #4417 (New): Applet: LU counter should only increase on successful location update

With the current code, the LU counter seems to increase on every location update, no matter if successful or not. osmith

11:06 AM Feature #4416 (Resolved): find out whether/how SIM applet can invalidate TMSI

Patches added to invalidate the TMSI, TMSIGPRS, KC and KCGPRS.
I've verified with wireshark, that the SIM now dire... osmith

09:32 AM Feature #4416 (In Progress): find out whether/how SIM applet can invalidate TMSI

We can update "EFLOCI (Location Information)", which consists of (3GPP TS 31.102, 4.2.17):
> - Temporary Mobile... osmith

12:56 AM Feature #4416 (Resolved): find out whether/how SIM applet can invalidate TMSI

Even after a SIM REFRESH with SIM Init, the SIM still uses the previous TMSI.
Find out how the SIM applet can forget... neels

11:02 AM Revision 15c3bfb4 (imsi-pseudo): Invalidate Kc, too

osmith

10:47 AM Revision 134f41f5 (imsi-pseudo): Invalidate TMSI, P-TMSI after changing IMSI

Now the ME doesn't try to send the TMSI anymore in the next Location
Updating Request, it directly sends the IMSI. osmith

09:11 AM Feature #4412 (Resolved): SIM applet: add debug menu entry to change IMSI

> However, the readBinary call throws a "AC_NOT_FULFILLED" exception.
Resolved by adding an ... osmith

01:02 AM Revision 4ac43a2f (imsi-pseudo): add SIM REFRESH command after IMSI change

Neels Hofmeyr