The most difficult part of the reading, which also happened to be a big part of the reading, was the overview of the DES algorithm. I just don't think I followed it very well. A slower walkthrough of the algorithm would definitely be helpful.
The most interesting part of the reading was the part about how DES is not a group. I enjoy abstract algebra, so it was interesting to see how abstract algebra can be applied to a consideration of the DES algorithm.
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