Difficult: This section was mostly review from my 2 cryptography classes and my abstract algebra class. As such the only difficult part was Theorem 2.4.2.4, but just because I had never seen it before. It makes sense, though, and it is a nice contradiction proof.
Reflective: I am constantly amazed by what we pull out of congruences and modular arithmatic. Just today I had to re-explain finite field math for AES to someone, and it is crazy how well it works. I am interested to see what we will pull out of it this semester.
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