I found it interesting that they have discovered not only a logical problem solving way to solve Vigenere ciphers but also a mathematical approach as well. And as usual, math seems to bring us closer to the answer faster. Also it was a good reminder that we can never be content with what we have already done, just as people used to think that these were strong codes and now we can break them easily, it is the same with everything we do, we should always try and push ourselves to do bigger and better things.
What i didnt understand particularly well, was how they decided that finding how many times you get the same letter after shifting the cipher text would yield the key length. I don't seem to be able to see the correlation between the letters matching up and the length of the key. Is it maybe because you hope to have letters like e make appearances in both pieces of the cipher text and you will be shifting letters the key length apart similarly? (I don't think that that made sense outside of my head, I guess thats what a blog is for...)
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