Codes And Ciphers

Polybius Square and Extended Polybius Square

-Polybius Square-

1 2 3 4 5
1 A B C D E
2 F G H I/J K
3 L M N O P
4 Q R S T U
5 V W X Y Z

Example: Cup- 13-45-35

-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

Example: cup- 13-43-34

(c)