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Polybius Square Cipher
Encrypt messages with the classic Polybius square cipher.
1 follower
Encrypt messages with the classic Polybius square cipher.
1 follower
Polybius Square Cipher is a compact learning app for the classical 5x5 Polybius square. Encode text into row-and-column coordinates, decode coordinates back into letters, and practise with short training challenges. I and J share position 24, and decoding 24 returns I.
