Mine would be creating pen and paper ciphers for my made up secret communication needs.
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Enigma comes to mind, but probably too complex to use like that, but the idea behind it is interesting maybe a simpler version could do it?
And to break it you can build a Turing Bomb!
ha yeah. I don’t do anything that complex, but I suppose I could just drop everything and dedicate my life to it now and I might get 1/10th of the way there