•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
•Extended Polybius Square
@1 2 3 4 5 6
1 A B C D E F
2 G H I J K L
3 M N O P Q R
4 S T U V W X
5 Y Z 0 1 2 3
6 4 5 6 7 8 9
