1. Difficult: I would say the hardest part to understand in these sections was trying to decrypt the explanations in 6.5 (The RSA Challenge)--what they were saying about large and small primes and modular dependencies. Obviously, this is a summary of a lot of work that other people did, so it was just to introduce the methods employed and show how much work it took to break this one message.
2. Reflective: 6.7 was very interesting, especially discussing one-way functions with backdoors. But most of all, I liked 9.1, how, in general, digital signatures work, how you don't even have to know the contents of a message to sign it, etc&.
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