1. I think Fermat's Little Theorem and Euler's Theorem are pretty cool. The really simplify congruences. It is amazing to see that discovered quite a while ago, these theorems play in important role in modern day cryptography.
2. I followed the three-pass protocol the nonmathematical way but the mathematical way was a little more hard to follow. Then primitive roots sections was murky. I understood the example and understand what a primitive root is ... sort of, but the propositions were not so clear.
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