Playfair Code
[Back] This page defines Playfair coding. With this we use a 5x5 matrix, and add the key at the start, and then place the rest of the letters (without repeating any). Next we take the plain text two characters at a time, and then draw a rectangle around then, and the other letters which bound the rectangle are then used. For example with a key of "playfair example" Theory[Calculator]
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Example with "napierun":
