Polybius Square

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                                                  POLYBIUS SQUARE
Type: Numbers
> Polybius square, also known as the Polybius checkerboard, is a device invented by the Ancient Greekhistorian and scholar Polybius, for fractionating plaintext characters so that they can be represented by a smaller set of symbols.
(Note: create a table of any size, readings should start in column then row)
Example:5x5

                                  A  B C D E
A|A|B|C|D|E
B|F|G|H|J|K
C|L|M|N|O|P
D|Q|R|S|T|U
E|V|W|X|Y|Z
Ciphertext: CB CD CC BD AA ED
Plaintext: M O N D A Y