I think that double encryption in DES is interesting in that it does not offer double security. Instead of searching for a pair of keys, you rather search for all of the first keys and save them all to memory. Then search for the second key and see if any of them match up, which is called a meet in the middle attack.
I didn't really understand about different kinds of DES. Could you go over the five different modes in class tomorrow. I think that it was just a lot of information to digest all at once.
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