Extract Kc from Phone?

Mad mad at auth.se
Thu Feb 17 14:31:34 UTC 2011

 On Wed, 16 Feb 2011 21:19:44 +0000 (GMT), MATTHEW EVANS wrote:
> Does anyone have any suggestions with regard to models of phone in
> which it is
> easy to view the current Kc? I have a Motorola C115, Nokia 3310/6630,
> Android
> Desire, iPhone etc. I can get every everything from the in built 
> field test
> modes, however I really want to get the current session key so that I 
> can
> verify/analyse my captured bursts.

 If you have a phone with access to the AT command interface via cable 
 bluetooth you can use the +crsm command to read the kc file from the 
 while the phone is operating.

 Try at+crsm=? to check if your phone supports this command, if it 
 returns an
 error, it doesn't.


 reads the Kc file from sim and returns a 9 octet hex string of which 
 the first
 8 ones are the actual Kc.

 I'm not sure which of your phones supports this, c115 and 3310 surely 
 iphone maybe depending on version, not sure, just test your phone zoo.
 BTW, most old Siemens phones support this.


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