Re: [Discuss-gnuradio] MSISDN Proximity Project

[Mark Steward]

On Tue, Apr 5, 2011 at 4:39 AM, Cristian Rougier <address@hidden> wrote:

Hello,

I'm looking for a way to do a software that can retreive the IMSI of proximity devices
and later the MSISDN (phone number) associated.

In a short i need to see the phone numbers of the proximity gsm devices.

I need to know if anybody can help me on this, or say me about the right way to start.

I trust you have the co-operation of the GSM operator, or understand the privacy implications of not having it.

An approach for mapping a number to a device on a specific cell is discussed in Karsten Nohl's talk[1].  Basically, you send empty messages in a particular pattern, and watch as the phone receives (and discards) them.  This doesn't make it easy to do on a large scale.

From a hardware perspective, while you may get some success with a USRP, you're probably better off looking at the Osmocombb project.

Mark

[1] http://events.ccc.de/congress/2010/Fahrplan/attachments/1783_101228.27C3.GSM-Sniffing.Nohl_Munaut.pdf