The Playfair cipher was invented in 1854 by Charles Wheatstone but was named after Lord Playfair who promoted the use of the cipher. The Playfair cipher was the first practical digraph substitution ...

Some code to use the playfair cipher. I'm using an algorithm I created rather than developing a matrix or anything. So it's cool math time. The playfair cipher is a graphical cipher that uses a 5x5 ...