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Title:
On the efficiency of the Clock Control Guessing Attack
Authors: Erik Zenner
Abstract:Many bitstream generators are based on linear feedback shift registers. A widespread technique for the cryptanalysis of those generators is the linear consistency test (LCT). In this paper, we consider an application of the LCT in cryptanalysis of clock-controlled bitstream generators, called \textsl{clock control guessing}. We give a general and very simple method for estimating the efficiency of clock control guessing, yielding an upper bound on the effective key length of a whole group of bitstream generators. Finally, we apply the technique against a number of clock-controlled generators, such as the A5/1, alternating step generator, step1-step2 generator, cascade generator, and others.
ePrint: https://eprint.iacr.org/2002/079
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