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Rijndael mix columns : ウィキペディア英語版 | Rijndael mix columns The MixColumns operation performed by the Rijndael cipher, along with the shift-rows step, is the primary source of diffusion in Rijndael. Each column is treated as a polynomial over GF(''28'') and is then multiplied modulo with a fixed polynomial ; the inverse of this polynomial is . ==MixColumns==
The MixColumns step can be performed by multiplying a coordinate vector of four numbers in Rijndael's Galois field by the following circulant MDS matrix: : This can also be seen as the following: : : : : Since this math is done in Rijndael's Galois field, the addition above is actually an exclusive or operation, and multiplication is a complicated operation.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Rijndael mix columns」の詳細全文を読む
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