1. The last part of section 4.4 was hard for me to follow. It may be because I haven't completed a course in Abstract Algebra and am therefore unfamiliar with group theory. Besides that, the trickiest part of this reading assignment was keeping track of all of the steps involved in DES. There are several parameters to keep track of within each step of the algorithm.
2. I loved reading about DES! I imagine that the guys who came up with it had a great time inventing it. It is so complex and intricate that I can't imagine how it can ever be broken. But I guess computers these days are a bit smarter than me. My favorite part was that if I went slowly enough, I was able to follow every step of the algorithm. I feel confident that if given enough time (days), I could successfully encrypt a short message using DES.
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