1. I understand how to encrypt the almost DES code, but not decrypt. That's still hazy. Also, in section 4.4 I understand what it means that the DES system is not a group, but I don't completely follow the proof. I get lost at the lemma because I don't understand why r=0. And about the proof of why DES isn't closed under composition, I'm not following all the notation I don't think so I'm not getting it. But I believe it. What's D?
2. Again, this seems like a really fast hard to break system that's not too complicated, and yet there are so many steps! How do you wrap your head around it? With a computer I guess.
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