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A linearization attack on the Key Stream Generator (KSG) of the modified E0 algorithm proposed by Hermelin [Proceedings of ICISC’99, Springer LNCS 1787, 2000, 17–29] is given in this paper. The initial value can be recovered by a linearization attack with O(260,52) operations by solving a System of Linear Equations (SLE) with at most 220,538 unknowns. Frederik Armknecht [Cryptology ePrint...
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