What I thought was the most interesting was when she was talking about the pigpen code. Even though it isn't a code that would be very strong if anyone was trying to break it, it seems like it would be fun to use with friends. Kerckhoff's principle seems to ruin all the fun of that kind of code...
Something that wasn't necessarily difficult to understand but that did spark questions, was the use of codes through other people. It seems that the more people that are involved in the use of a code the more chance there is of it being broken. For example Ardis was talking about how people would send messages through telegram, and normally that the person who was sending the message would have to have someone else actually send the telegram. At some point, wouldn't the person who was sending gibberish get curious enough to try and find out what was being sent? I wonder if there is some kind of formula or idea about how quickly code breaks down depending on the number of people using it. Maybe that is the idea behind public key encryption.
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