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In FSE’09 Hermelin et al. introduced the Algorithm 2 of multidimensional linear cryptanalysis. If this algorithm is m-dimensional and reveals l bits of the last round key with N plaintext-ciphertext pairs, then its time complexity is $\mathcal{O}(mN2^l)$ . In this paper, we show that by applying the Fast Fourier Transform and Fast Walsh Hadamard Transform to the Algorithm 2 of multidimensional...
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