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De Furtivis Literarum Notis
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De Furtivis Literarum Notis is a manuscript written by Giovan Battista della Porta in Template:Book that describes the use of a deck of card to encode secret information by writing on the sides of the deck in a known order, then shuffling the cards to destroy the order and render the message illegible to anyone not familiar with the stack. The plot of Unshuffled later contained this idea.