Infoscience

Conference paper

Reduced complexity attacks on the alternating step generator

In this paper, we present some reduced complexity attacks on the Alternating Step Generator (ASG). The attacks are based on a quite general framework and mostly benefit from the low sampling resistance of the ASG, and of an abnormal behavior related to the distribution of the initial states of the stop/go LFSR's which produce a given segment of the output sequence. Our results compare well with previous results as they show a greater flexibility with regard to known output of the ASG, which amounts in reduced complexity. We will also give a closed form for the complexity of attacks on ASG (and SG) as presented in [13].

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