1. I really had a hard time understanding the various "modes of operation" discussed in 4.5. It was interesting however to read them in the order they were presented. Each successive mode was described in manner showing how it improved on the previous one mentioned. However, I didn't feel like I understood a single one. Mostly I think this has to do with the fact that I still have trouble understanding a lot of the common vocabulary words that are thrown around a lot and a lot of the symbols that are used.
2. I thoroughly enjoyed the chapters on the history of DES and password protection and the like. They were a little more relatable to me. It was amazing to think about how decrypting technology improves right along with encrypting technology. It's almost as if the two are growing exponentially at the same rate. However, it seems as if decrypting technology is growing a little faster simply because it mentioned the drastic change in time it took to break DES on two different occasions about a year apart.
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