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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...
This paper investigates two new design rules of nonlinear combining functions in stream ciphers. It is shown that a combining function with high nonlinearity and high order correlation immunity is still not enough to prevent the divide and conquer attack and the BAA attack (or the best affine approximation attack) since the autocorrelation function of the combining function may also be leaked much...
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