Achterbahn-128 / 80 : Design and Analysis

@inproceedings{Gammel2007Achterbahn1288,
  title={Achterbahn-128 / 80 : Design and Analysis},
  author={Berndt M. Gammel and Rainer G{\"o}ttfert and O. Kniffler},
  year={2007}
}
We determine the imbalances of the keystreams produced by Achterbahn-80 and Achterbahn-128 in two different ways. The number of cyclically inequivalent keystreams produced by the keystream generators of Achterbahn-80 and Achterbahn-128 is determined. An abstract model for the keystream generator of a primitive NLFSR combination generator is used to justify the correlation attack introduced in [6] and generalized in [8]. A common error in a guess and determine attack is discussed. The optimal… CONTINUE READING

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