Polybius Square

In cryptography, the Polybius square, also known as the Polybius checkerboard, is a device invented by the Ancient Greek historian and scholar Polybius, described in Hist. X.45.6 ff., for fractionating plaintext characters so that they can be represented by a smaller set of symbols.

Read more about Polybius Square:  Basic Form, Telegraphy and Steganography, Cryptography

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