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

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

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

02/24/2020

11:41 AM Feature #4412 (In Progress): SIM applet: add debug menu entry to change IMSI

I've implemented a menu, and a submenu for "Change IMSI":... osmith

02/21/2020

08:22 PM Feature #4401: Proof of concept for counting Location Updates in SIM applet

On Fri, Feb 21, 2020 at 02:33:54PM +0000, osmith [REDMINE] wrote:
> I thought that I need to access the filesystem an... laforge

02:33 PM Feature #4401 (Resolved): Proof of concept for counting Location Updates in SIM applet

I thought that I need to access the filesystem and write it there (which had me confusing: where to write it exactly?... osmith

11:56 AM Feature #4401: Proof of concept for counting Location Updates in SIM applet

After testing the hello world example, I've modified it to display a message on every location update. This works! Th... osmith

07:10 AM Feature #4401 (In Progress): Proof of concept for counting Location Updates in SIM applet

osmith

02:48 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

> How does a SIM/baseband behave when its IMSI is changed?
Let's add a menu entry that changes the IMSI to check t... osmith

02:48 PM Feature #4412 (Resolved): SIM applet: add debug menu entry to change IMSI

Before drafting the spec, we need to check how the baseband/SIM behave if the IMSI changes. Adding it to the menu of ... osmith

02/20/2020

04:22 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

With ATT=0, LU (Periodic) still happen as usual. neels

04:10 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

I just tested setting ATT=0 in SI3 Channel Description via
osmo-bsc.cfg... neels

01:55 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

Ah, I did find that, but interpreted it differently:
ATT, Attach-detach allowed (octet 2)
Bit
7
0 MSs in the... neels

02/19/2020

06:21 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

On Wed, Feb 19, 2020 at 02:32:02PM +0000, redmine@lists.osmocom.org wrote:
> If there is a switch to tell the MS to d... laforge

02:32 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

If there is a switch to tell the MS to do silent IMSI Detach, then it should be sufficient to set it.
Spent some tim... neels

12:55 PM Feature #4404: Research: Make sure that we can silently detach the IMSI

laforge "pointed out":https://osmocom.org/issues/4400?issue_count=5&issue_position=5&prev_issue_id=4401#note-16, that... osmith

10:34 AM Feature #4404 (Stalled): Research: Make sure that we can silently detach the IMSI

laforge wrote:
> neels wrote:
> > The usefulness of the project seems to pivot on the visibility of the IMSI Detach... osmith

12:50 PM Feature #4400: Approach C: HLR decides and sends the entire next pseudo IMSI to SIM

laforge wrote:
> > > I doublt IMSI DETACH is used much in real-world networks these days as it is unauthenticated
>... osmith

11:11 AM Feature #4400: Approach C: HLR decides and sends the entire next pseudo IMSI to SIM

On Wed, Feb 19, 2020 at 10:35:24AM +0000, redmine@lists.osmocom.org wrote:
> what do you think about warning the user... laforge

10:35 AM Feature #4400: Approach C: HLR decides and sends the entire next pseudo IMSI to SIM

laforge wrote:
> One disadvantage of such an "explicit" mechanism relying on OTA SMS is that any
> intermediary / a... osmith

10:40 AM Feature #4402 (Stalled): Specification: Create draft

osmith

10:34 AM Feature #4403 (Feedback): OsmoHLR: How to interface with SMS service?

laforge "wrote":https://osmocom.org/issues/4400#note-14:
> On Tue, Feb 18, 2020 at 04:44:23PM +0000, neels [REDMINE]... osmith