[Gsmmap] Strange situation

Karsten Nohl nohl at srlabs.de
Sat Apr 12 10:00:19 CEST 2014


Dear Akid,

> why its asking authentication while impersonating but not while using S2
> note: S2 is registered on network with proper sim card. 

I think you already answered the question: The S2 was most likely authenticated during registration. In some networks, one authentication is valid across multiple transactions (compare gsmmap.org's country reports).

Cheers,

     -Karsten


On Apr 12, 2014, at 12:28 , Akib Sayyed <akibsayyed at gmail.com> wrote:

> Dear List 
> 
> I am observing a strange behavior on gsm network.
> 
> I have my own gsm impersonating tool. I also have S2 with logging enabled on wireshark.
> 
> I take TMSI of S2 simcard and put it in impersonating tool. and place call
> 
> It ask me authentication but when i place call with S2 it doesnt ask authentication.
> 
> why its asking authentication while impersonating but not while using S2
> 
> note: S2 is registered on network with proper sim card. 
> 
> -- 
> Akib Sayyed
> Matrix-Shell
> akibsayyed at gmail.com
> akibsayyed at matrixshell.com
> Mob:- +91-966-514-2243
> 
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