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Codes and Ciphers :: Polybius Square

A Polybius Square is a table that allows someone to translate letters into numbers. To give a small level of encryption, this table can be randomized and shared with the recipient. In order to fit the 26 letters of the alphabet into the 25 spots created by the table, the letters i and j are usually combined.

 12345
1ABCDE
2FGHIK
3LMNOP
4QRSTU
5VWXYZ

To encipher a message you replace each letter with the row and column in which it appears. For example, D would be replaced with 14.

To decipher a message you find the letter that intersects the specified row and column.

Example:
Plaintext: This is a secret message
Ciphertext: 44232443  2443  11  431513421544  32154343112215 


Polybius Square Encoder / Decoder

Plaintext
Ciphertext

 




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