1. Near the end of the section, when they start talking about permutations and how to find the three letter daily key, I start to get confused. We just started talking about cycles in abstract algebra, and I'm still not quite comfortable with them. Once we know AD, BE and CF, how do we find the key? Also, how does this key necessarily add to the security? It seems to me like it detracts from it. Can't the cryptanalysts simply start frequency analysis on the 7th character?
2. It's really cool to be learning about a system that played such a big role in World War II. I also liked that it was cracked. Go England. This is the first cryptosystem we've talked about which conceptually actually requires a machine, and the fact that it requires a machine makes me wonder if, with such strides in technology the world is making, there are newer variations of enigma which are harder to break.
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