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If it used a one time pad properly, it's in theory uncrackable.

http://en.wikipedia.org/wiki/One_time_pad

If the key is truly random, never reused in whole or part, and kept secret, the one-time pad provides perfect secrecy



The idea of the project is that it's supposed to be crack-able. So a OTP is probably out. Otherwise K4 is just random noise and not an obscure puzzle.


Or if he made a mistake (because he has no idea what he is doing), it is uncrackable.


When I was a kid, I had this idea that I was excited about, that I'll write meaningless codes in pieces of paper and strategically place them to drive people who try to figure out crazy. People just didn't care.




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