[Gsmmap] GSMmap LiveISO

Karsten Nohl nohl at virginia.edu
Mon Jan 21 15:08:57 CET 2013


Dear Mathias,

On Jan 20, 2013, at 18:18 , Mathias Püstow wrote:

> Dear Karsten,
> 
> thanks for your answers.
> 
> On Jan 20, 2013, at 15:12 , Karsten wrote:
>> 
>> Dear Mathias,
>> 
>> On Jan 20, 2013, at 13:09 , Mathias wrote:
>> 
>>> Hello,
>>> 
>>> did I understand it correctly that capturing of data for GSMmap with the
> LiveISO is only possible after entering the TMSI?
>> 
>> The TMSI is not technically required but acts as a legal shield from
> recording other people's traffic. If you know your legislations rules on
> recording public, encrypted traffic and feel comfortable >skipping the TMSI
> check, then it can easily be commented out from the bash script. Definitely
> check with a lawyer before doing so.
>> 
>>> How do I find my own TMSI?
>>> Please kindly provide a step by step description on how to find my own
> TMSI
>> 
>> Finding the TMSI is not possible on every phone model. Blackberries show it
> in the 'Engineering screen'; Android has apps that show radio information.
> 
> For GSMmap LiveISO I am using the Motorola C123.
> Is there a way to find the TMSI with the OSMOCOM firmware or Motorola's
> firmware with the C123?>

The C123 does not have a TMSI while it is recording traffic. It's running in a radio-passive mode (and does not need a SIM card either.)

> A second question:
> Would the same TMSI remain valid and be used, if I use my SIM card with a
> Blackberry, note the TMSI, switch off the Blackberry and then use the same
> SIM card with the C123?

The TMSI will change if you move the SIM to another phone.

Cheers,

     -Karsten


>> Cheers,
>> 
>>   -Karsten
>> 
> Best Regards,
> 
>  Mathias
> 
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