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The Playfair code, developed in 1854 by Charles Wheatstone and popularized by Lord Playfair, is an example of asymmetrical encryption using polygram substitution. Despite its complex terminology, it is relatively simple to use, requiring no computers or advanced mathematics. The code is more sophisticated than other methods like the Caesar cipher but remains accessible for anyone to encode or decode messages. To implement the Playfair code, one must create a 5x5 grid filled with letters of the alphabet, accommodating 26 letters by combining I and J. The method allows for variations that enhance its complexity while retaining ease of use for regular individuals.
