1. I think the most difficult part of understanding was the description of finding the key when the author began on vector Ao, Ai, Aj, etc. At the end, I caught the main jest of it and the probabilities, but it is still hazy.
2. I think the Vigenere Cipher is way cool and how it takes care of the frequency analysis of the letters. Even more cool is the methods for breaking it, even though they are not completely understood. Also the book with no e's is pretty interesting.
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