1. The most difficult part for me was when they explained why the method for finding the key length and key. I got really lost and confused with all the different vectors and i and j.
2. I have loved reading about each of these new ciphers. I think they are clever and interesting to learn about. It's interesting to see how some build on earlier ciphers (like the Vigenere building on the shift cipher) while others are completely unique.
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