It was difficult for me to understand OFB. I understand that it is a way of implementing DES, but I don't get it. I know it's good for error correction. I didn't understand most of this DES section, but it was all very interesting. The five methods of implementing DES were confusing to me, though it made sense that we would sometimes need to correct for messages that were not perfect multiples of the block length.
I did not realize how much computers have improved when it comes to an ability to do calculations. It really shouldn't surprise me, just with all the graphics available, but it's amazing how much a well-programmed computer can do.
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