1. I was lost most of the reading. I think what throws me off the worse it the S-boxes. I just can't quite figure out how they are used. They send in 4 bits, but how do they chose they out put. The example wasn't clear to me how that was done.
2. Cryptography uses a lot of different areas of mathematics. When I was reading section 4.4 DES Is Not a Group. I had to pause and recall what a group was from Math 371. I am going to have to pull out my abstract algebra book and review the properties of a group.
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