1. Well first off, this whole section was confusing from the beginning to the end. The algorithm in 5.1 made sense for the most part, but the in depth part in 5.2 was pretty cryptic to me(haha). I think it would be amazing if we went over the different layers in depth(with examples!) to show how they actually work!
2. I noticed in 5.1 that the first transformation - ByteSub - that it is a non-linear layer that is used for resistance to differential and linear cryptanalysis attacks. It kind of caught my eye, we haven't really used any sort of differential attacks(to my knowledge at least). I'm sure I'll regret saying it later, but it sounds interesting and like a good challenge to try.
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