1. The first part of the explanation concerning the cracking of Vigenere makes a lot of sense. The part that was confusing was the mathematical explanation as to why it works. I understand the mathematical concepts behind the explanation. I think it was just all being thrown at me in quick succession, causing me to have a perplexed expression. However, I think a second, maybe a third reading with some scratch paper would solve this.
2. It's interesting to see how much math there actually is behind cipher breaking even when it comes to simple substitution methods and variations thereto. I knew that there was a lot of math behind ciphers, but I had no idea there would be so much behind substitution methods and solving them.
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