Codes And Ciphers

Polybius Square

Polybius Square
  its a 5x5 grid of letters
   its a number substitution cipher, and since our alphabet is consisting of 26 letter we will write I and J on the 4th row

just like this

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

And we will write a ciphered text like this

44-23-11-33-43/21-34-42/31-24-25-24-33-22