(Difficult) The first method for finding the key was the most difficult for me to understand. For me personally it was easier to follow the second method because it seemed more concise, put into mathematical terms without too much explanation.
(Interesting) To me the most interesting part of the section was finding the key length. I was intrigued at how lining up the same cipher on two lines and then displacing one of them could reveal the key length. It made me ponder the logic about how this method worked, in looking for coincidences in the two ciphers displaced a few characters from one another. It amazes me how much time and effort goes into creating ciphers, and yet at the same time, how much time goes into cracking them. With such detailed examples of how to solve ciphers it is no wonder that encryption has been an ever changing discipline throughout history. Even today, many methods of encryption become obsolete after years of use and abuse. This is part of the reason why I wanted to learn about cryptography, because it is a career field in which technology changes and the learning process never ends.
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