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Gerard Pinto gerardfly9 at gmail.comHi Domi, Thanks! While I building the same, I was wondering 'may be SAP protocol' was built for it. But thanks again for confirming it! And Yes, I used an external card reader too. I did not check all osmocom projects, just checked out softSIM it does mention SAP. Sounds great! Thanks for the feedback again. Thanks, Gerard On Tue, Mar 28, 2017 at 12:27 AM, Tomcsányi, Domonkos <domi at tomcsanyi.net> wrote: > Hi Gerard > > 2017. márc. 28. dátummal, 9:10 időpontban Gerard Pinto < > gerardfly9 at gmail.com> írta: > > 2) I have been trying something different with OsmocomBB, osmo-sim-auth > and Tor lately - I would like to hear your views on the same. > > Attack Model: Geo-Location Anonymous calling in GSM. > > > > Description: > > 1. The attacker uses OsmocomBB phone to make a call using a sim card > service. (No sim card present in the phone). > > 2. For this, I have taken the SIM card outside OsmocomBB and re-written > all SIM API's in osmo-sim-auth (which is the sim card service). > > 3. This sim card service is deployed over Tor network, so no one can > actually know the location of the SIM card service. > > 4, The osmocombb connects to the network and uses this sim card service > for authentication etc. > > 5. The whole setup of calling etc is initiated by the sim card service, > which is itself behind Tor. > > > > 6. Now, This SIM card service can be used my multiple phones, so now you > are not exactly going to track the phone since if I use the SIM card > service to another phone (cell area) the DB entry in VLR has changed which > says the location has changed. > > 7. My experiments worked well on a LIVE network, understanding the delay > in Tor the network, still, the BTS was accepting RES response challenge > from the SIM card service behind Tor - I still have to calculate the exact > max acceptable delay in sending RES back to BTS to confirm this! > > This is a very interesting idea, I like it! I wanted to mention the SAP > protocol that is available in OsmocomBB's mobile app via a Unix domain > socket since some time now. It might be even easier to use it for your > idea. I used it via an external card reader and softSIM to provide a SIM > card for OsmocomBB. > > Cheers, > > Domi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20170329/045d7d3b/attachment.htm>