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Originally Posted by RogerBW
I think there's a place for a skill in operating pen-and-paper cryptosystems such as the Playfair cipher without necessarily being able to devise new ones, but I'm not sure what that skill would be.
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I think that might be Administration:
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Originally Posted by Wikipedia's page on Playfair
It [Playfair] was rejected by the British Foreign Office when it was developed because of its perceived complexity. When Wheatstone offered to demonstrate that three out of four boys in a nearby school could learn to use it in 15 minutes, the Under Secretary of the Foreign Office responded, "That is very possible, but you could never teach it to attachés."
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