are we certain there is always 4 frames of known plain text available thus we always have 204 known key streams ? is this documented somewhere ? are we always having SACCH data available ? which side of the traffic , up link or down link ? to my understanding this attack is based on dividing the whole key space to the amount of known key streams , is that right ? so can we use different sources of known plain texts and put them together ? for example i see there is also known plain text in LAPDm , and maybe in other places . is it possible to put them together somehow ? is there a list know known plain texts of the algorithm ? and finally , those known 4 frames should be continues in the real traffic ? sorry to ask a lot of questions . i'm learning :)
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