The most interesting part for me was the affine filter. It was interesting to see how such an easy modification could be used to increase the security of the message. I also enjoyed seeing a formal description of how to solve substitution ciphers. Often as students we just intuit the way things should be without knowing why they are that way.
Once again we haven't reached any really hard concepts so the hardest of what I did read was the formal description of how to break a cryptography cipher. This was because it made me pay attention to not only frequencies of letters, but also the frequencies at which letters occur together.
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