The Playfair cipher was the first practical digraph substitution cipher. It was invented in 1854 by Charles Wheatstone but was named after Lord Playfair who promoted the use of the cipher. The technique encrypts pairs of letters (digraphs), instead of single letters as in the simple substitution cipher.

The alphabet can be generated using a keyword or phrase and the rest of the remaining letters of the alphabet will be calculated. Note: Usually the letter 'j' is merged with 'i' but you can customize that below to your liking in the Alphabet Options.