The Polybius square, also known as the Polybius checkerboard, is a device invented by the ancient Greeks Cleoxenus and Democleitus, and made famous by the historian and scholar Polybius.[1] The device is used for fractionating plaintext characters so that they can be represented by a smaller set of symbols, which is useful for telegraphy, steganography, and cryptography. The device was originally used for fire signalling, allowing for the coded transmission of any message, not just a finite number of predetermined options as was the convention before.[1]
^ ab"Polybius • Histories — Book 10". penelope.uchicago.edu. Retrieved 2020-04-13.
The Polybiussquare, also known as the Polybius checkerboard, is a device invented by the ancient Greeks Cleoxenus and Democleitus, and made famous by...
biography. Polybius was a close friend and mentor to Scipio Africanus the Younger, and had a lasting influence on his decision making and life. Polybius was...
bars, pipes or the walls inside a cell. The tap code is based on a Polybiussquare using a 5×5 grid of letters representing all the letters of the Latin...
was a fractionating transposition cipher which combined a modified Polybiussquare with a single columnar transposition. The cipher is named after the...
table, one would first fill in the spaces in the table (a modified Polybiussquare) with the letters of the keyword (dropping any duplicate letters),...
classical cryptography, the bifid cipher is a cipher which combines the Polybiussquare with transposition, and uses fractionation to achieve diffusion. It...
proposed a different type of compound music cipher modeled after a polybiussquare cipher. Öttingen-Wallerstein used a 5x5 grid containing the letters...
Chief Directorate with its spies. First the encipherer constructs a Polybiussquare using a mixed alphabet. This is used to convert both the plaintext...
and every letter in the message replaced by its co-ordinates (see Polybiussquare and Straddling checkerboard). Another method of fractionation is to...
alphabets for each letter of the message. He started with a tabula recta, a square with 26 letters in it (although Trithemius, writing in Latin, used 24 letters)...
torches on the left set. Byzantine beacon system Optical communication Polybiussquare Greek hydraulic semaphore system Aeschylus. Oresteia, Agamemnon (in...
after a successful hunt. Modern aviation has made skywriting possible. Polybiussquare Optical telegraph Ivan, Djordjevic (2010). Coding for Optical Channels...
is much more difficult to decode is the Vigenère square, an innovative encoding method. With the square, there are 26 different cipher alphabets that are...
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