> i found than in some African countries the find_kc app not working. Kraken 
> gives me a lot of potential keys, but the find_kc application does not bring 
> a match ...

Maybe they are using randomization so you are not actually guessing the 
keystream. Is there any way to check it against a communication capture with 
known key?

> Maybe i need to roll back more or less than 100 clocks in find_kc?

You should always roll exactly the same amount as is the position of your 
fragment in your burst.
This is a standard GSM-spec thing, I don't think it would be possible for the 
network to alter this.


On 22. 04. 19 11:39, Max Parker wrote:
> Hello all
> i have strange problem with find_kc app
> i found than in some African countries the find_kc app not working. Kraken 
> gives me a lot of potential keys, but the find_kc application does not bring 
> a match ...
> Maybe i need to roll back more or less than 100 clocks in find_kc?  
> Has anyone met this behavior?
> Thnaks
> 
> -- 
> Best Regards,
> Max
> 
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-- 
Jan Hrach | https://jenda.hrach.eu/
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