1. I think the hard thing for me to follow was how they described breaking the affine cipher with ciphertext only. It appeared that it was just a brute force, but then where did the 20 character ciphertext come in from?
2. I found it interesting how modulo was used to describe shift ciphers and affine ciphers. I never have thought of a shift cipher as mod 26, but it sure works good to describe it. I liked how the book described the ways to break it the ciphers using ciphertext, known plaintext, chosen plaintext, and chosen cipher text. It seemed like they were both pretty easy to break.
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