1. The most difficult part of the section was bout how to reverse MC and then ARK by making some IMC and InvAddRoundKey. I wasn't really sure why this worked.
2. Having seen something like DES previously, understanding AES was definitely easier. It was nice to see a clear reason for why some of the things were derived, like the S-box. This is such a complicated, secure system that I wonder how someone would come up with it!
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