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An algorithm recently introduced by Meier and Staffelbach is modified to be applicable to streamciphers with running key generators (RKG) consisting of a single linear feedback shift-register (LFSR) with a (nonlinear) feedforward filter applied to it. It is shown that, under certain assumptions, this modified algorithm can be used by a cryptanalyst to determine an equivalent system-consisting of a couple of LFSR’s together with a suitable combining function- which generates the same running key sequence. Finally, design criteria are given, which ensure that a RKG withstands the modified attack.

A Fast Correlation Attack on Nonlinearly Feedforward Filtered Shift-Register Sequences