The Playfair cipher or Playfair square or Wheatstone-Playfair cipher is a manual symmetric encryption technique. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use.
The Playfair cipher uses a 5 by 5 table containing a key word or phrase. Memorization of the keyword and 4 simple rules was all that was required to create the 5 by 5 table and use the cipher.
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Unfortunately, the link was expired.I have updated the code.
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