Sorry, this is a bit of topic. But I wonder if anyone knows of a public key system that can realistically be done by pencil and paper. I realize anything a computer can calculate could conceivably be done by hand, but I'm looking for something realistic. I don't consider raising very large numbers to very large powers realistic.
I am aware of none, and there are some good theoretical reasons to think there are none.
That said, beware of all theories: when theory conflicts with the real world, theory must give way.
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