Hello,

I'm interested to learn more about the project you're working on and I would 
kindly ask you to help me with an answer to a simple question.
As far as I understood, the rainbow tables provide, for 64 bits known of 
keystream, the initial internal state that generated those bits. Once you have 
the initial internal state, you can  find the secret key used. My question is 
how do you   have access to  few samples of 64 bits of keystream, how do you 
get to find them out?  Is it because of that padding with known plaintext? but 
then, I don't get it with that known plaintext, who add is there?
 
I tried to follow the explanations given in the "GSM Basic" section but it's 
not clear for me. 

Thank you very much,


      
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