Cryptanalysis of non-linear filter generator with {0,1}-metric Viterbi decoding
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An algorithm using a trellis representation of the Boolean function input to cryptanalyze a non-linear filter generator was presented. The feedback polynomial, the spacings between the inputs of the function and the n-input Boolean function were assumed to be known to the cryptanalyst. The memory of the system depended heavily on the spacings between the function inputs.