Hi all,

When entering Engineering mode in my smartphone Blackberry Bold 9700 I can read 
a very long 72-bit Kc. 

E.g:
B0 27 3A 33 80 88 88 00 00
or
A8 2E DA 7C 3F 98 6C 00 01

Can anybody help to extract correct 64 bit that will be used to decrypt GSM 
data?

I tried to remove the first or the last two octets and use the result to 
decrypt but fail.

Thank you very much!

Tien
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