What was the most difficult part of the material for you?
I didn't understand *why* the first method of finding the key length works exactly. I reread the explanation several times and I'm sure I could use it, but I'm still not quite understanding why it works.
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 think it's interesting that using a Vigenere cipher makes the frequencies of the letters in the ciphertext close to 1/26, but once you've determined the key length and divided the message into parts, you still use frequency analysis (or something closely related to it) to break the cipher.
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