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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“In old times people used to try and square the circle; now they try and devise schemes for satisfying the Irish nation.”
—Samuel Butler (18351902)