Polybius Square Cipher: Encrypt and Decrypt Online

in "Polybius Square Ciphers"

The Polybius square cipher, also known as the Polybius checkerboard is a device by the Ancient Greeks Cleoxenus and Democleitus.

The cipher fractionates plaintext characters so that they can be represented by a smaller set of symbols.

Use the above Polybius square decoder and encoder to encrypt/decrypt simple messages.

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