The hardest thing to follow was all the little nuances that exhibited themselves in the different modes. The error correctly especially took me a little to understand since I have never dealt with it before. The way the key was having an eighth of it shifted off was what confused me at first.
The most interesting thing in the book was actually reading how DES was broken. That is actually my favorite part of this entire class, learning how various algorithms are attacked. It is interesting to me that we still choose brute forcing, as there really aren't many weaknesses that are usefull enough. I find it really interesting that till this day DES's greatest weakness is the length of the key. It is too bad that unlike AES it didn't allow multiples of keys. Though maybe AES should be changed to allow more than just the three that it does.
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