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1

As I have duplicated your question by mistake and non of us have had an answer, I request help to the authors to know why those parameters where selected like that. The affine transformation is a vector space operation $(\mathbb{F}_{2})^8$, and the simplicity comes from the fact that, from the bunch of possible transformations the one used can be also ...

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Finally I've went to the source and I've mailed the Rijndael's authors. They have answered very fast and very nice. I've understood the other way around. The affine transformation is over the vector space $((GF(2))^8$ and what they've say as simplicity was that, between all the possible affine transformations they select one that can also be described as ...

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