1. (Difficult): The most difficult part of this is decrypting the affine code. I understand encrypting it so I should understand decrypting; maybe I just need another look at it and some more practice. How does the book know how many possible keys there are from the numbers? Not sure about that.
2. (Reflection): The most interesting part of these sections is the frequency table. I knew from common sense to look for special combinations when decrypting a substitution code but to have the probabilities and then consider the probabilities of commuted order of letters...wow lots of detail what an art! And a cool puzzle.
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