Polybius Square

5 by 5 coordinate substitution cipher.

The Polybius Square replaces each plaintext letter with a pair of row and column symbols from a 5 by 5 alphabet square. I/J are commonly combined, but the switch letter can be changed in Alphabet Options.

Plaintext

Alphabet

Enter a keyword, phrase, or alphabet and the 5 by 5 square will be calculated for you.

This cipher only has 25 characters, so one character must be switched.

Switch

Into

Keyword or phrase

Use last instance of keyword letters Reverse keyword Put keyword on right side Reverse alphabet portion Randomize alphabet Reverse final result

Cipher Key

Ciphertext