Some of the things that I found most interesting, were just thinking about how all throughout history, lots of people, famous people, people I've heard of and read about, have used codes to deliver information. I also hadn't realized, or thought about completely how much knowledge and mastery of other peripheral things would matter in cryptography. For example in substitution ciphers, the more you know about the language you are working in the better, knowing things like h often precedes e but hardly follows it, are some of the cruxes that code breaking is based on.
What is hard for me to stomach a little, is how much guesswork needs to be done. Cryptography has proven to be very different kind of math, it's not just every time you see this kind of problem, apply this formula. But in essence you have to be willing to try many different things and several kinds of attacks. The approaches are still very logical, which appeals to me, but I am afraid that the guesswork that needs to be done will be ever increasing as we move into harder types of codes.
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