Difficult: the part about the dot product and vectors was difficult--mostly because I haven't done anything with vectors or dot products in at least a year. And finding the key using dot products would be difficult too.
Interesting: I really like how easy this textbook is to understand and follow compared to other math textbooks that I've used. Anyway, I thought the vigenere cipher was really interesting and that it's a good way to "shake up" so to speak the substitution method to make it seemingly more random. I also like how you can use a word or a set of numbers as your key interchangeably.
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