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Playfair cipher

From Wiktionary, the free dictionary

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English

English Wikipedia has an article on:
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Etymology

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

Noun

Playfair cipher (plural Playfair ciphers)

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

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