(plural Playfair ciphers)
Named after Lord Playfair, who promoted it. (It was invented in 1854 by Charles Wheatstone.)
"playfair-cipher." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/playfair-cipher>.
playfair-cipher. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/playfair-cipher
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