What was the most difficult part of the material for you?
I had some trouble understanding the proof about DES not being a group--that double encrypting with two keys was not the same as encrypting with a third key.
What was the most interesting part of the material? How does this material connect to something else you have learned in mathematics? How is this material useful/relevant to your intellectual or career interests?
I thought it was interesting that a lot of the structure of DES ended up depending on the technology available at the time, particularly the limits on how much information could be put on a computer chip.
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