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Playfair cipher

From Wiktionary, the free dictionary

English

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English Wikipedia has an article on:
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Etymology

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Named after Lord Playfair, who promoted it. (It was invented in 1854 by Charles Wheatstone.)

Noun

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Playfair cipher (plural Playfair ciphers)

  1. A manual symmetric encryption technique that encrypts pairs of letters (digraphs).
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