Public key crypto by hand

Brian Mearns bmearns at
Thu Jul 30 14:33:40 CEST 2009

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.


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