Three kinds of equivalent ciphers of AES are presented by separating S-box's affine transformation. Results from research showed that MixColumn matrix influenced the separation of S-box's affine transformation to a great extent. As a result, suggestions to the improvement of MixColumn algorithms were made.
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FENG Guozhu, DUO Lei, LI Chao. Three Kinds of Equivalent Cipher of AES[J]. Journal of National University of Defense Technology,2008,30(1):125-128.