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Although there are many different approaches used in cryptanalysis of nonlinear filter generators, the selection of tap positions has not received enough attention yet. In this paper we examine the security of nonlinear filter generators that output several bits at the time against a variant of a guess and determine attack that takes into account the tap positions of the generator. In difference to...
For stream ciphers which use binary linear feedback shift registers as stream generators, fast correlation attack is one of the most important attacks. Aiming at the shortcomings of serial algorithm, the proposed technique is based on parallel computing. This kind of attack divides the initial state into several parts, uses multiprocessor to recover all parts of the initial state synchronously. Comparing...
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