What was the most difficult part of the material for you?
I think, of the three ciphers, the affine is the most difficult to understand, particularly as regards decryption, but on rereading that section, I think I have it now. As long as alpha is coprime with 26, the cipher will map every letter of the alphabet to a distinct letter of the ciphertext alphabet, making decryption possible.
What was the most interesting part of the material? How does this material connect to something else you have learned in mathematics? How is this material useful/relevant to your intellectual or career interests?
I thought it was interesting to see the most common digraphs, and which could be reversed (ER, for example) and which couldn't (TH).
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