This sections was very interesting to read, though the methods of decrypting a Vigenere cipher are still a little fuzzy to me. It makes sense how the cipher works, but the method of finding the key using dot products still doesn't exactly make sense to me. I kind of get it, but it's a little confusing why the maximum dot product appears when the proper shift is found.
However, this code seems very usable to me. It sounds quite familiar, actually. I think it might have been used the movie "The Prestige" to encode a journal. I'm not sure, though. It makes sense now how a cipher can be developed that uses multiple keys. In fact, encryption keys in general make a lot more sense because of this cipher. I like it. I kind of want to start sending messages with this cipher.
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