The Polybius square, 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...

similarities to the Polybius square, which the author used as examples in his book. He explicitly solves an example of a Polybius square based cipher from...

up Polybius in Wiktionary, the free dictionary. Polybius (c. 203 BC – 120 BC) was an ancient Greek historian. Polybius may also refer to: Polybius (freedman)...

bars, pipes or the walls inside a cell. The tap code is based on a Polybius square using a 5×5 grid of letters representing all the letters of the Latin...

War II. In this case, double Playfair refers to a method using two Polybius squares plus seriation. Even variants of Double Playfair that encipher each...

classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion. It...

was a fractionating transposition cipher which combined a modified Polybius square with a single columnar transposition. The cipher is named after the...

table, one would first fill in the spaces in the table (a modified Polybius square) with the letters of the keyword (dropping any duplicate letters),...

The four-square cipher is a manual symmetric encryption technique. It was invented by the French cryptographer Felix Delastelle. The technique encrypts...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

proposed a different type of compound music cipher modeled after a polybius square cipher. Öttingen-Wallerstein used a 5x5 grid containing the letters...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

Chief Directorate with its spies. First the encipherer constructs a Polybius square using a mixed alphabet. This is used to convert both the plaintext...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

and every letter in the message replaced by its co-ordinates (see Polybius square and Straddling checkerboard). Another method of fractionation is to...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

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)...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

it, Hirsch tweeted a hint for the final clue, which revealed that a Polybius square was needed to solve the clue. Fans also needed to find a pattern in...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

encrypt, a table of alphabets can be used, termed a tabula recta, Vigenère square or Vigenère table. It has the alphabet written out 26 times in different...

usually known as a Polybius square or "checkerboard." The i-ro-ha alphabet contains forty-eight letters, so a seven-by-seven square is used, with one of...

cipher's proneness to a frequency attack. Fractionation: Unlike in the Polybius Square (where every character is represented by a pair of digits), a straddling...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

for instance, through the utilization of the chi-squared statistic or by minimizing the sum of squared errors between the observed and known language distributions...

does meet these criteria. That was a system using the Polybius square to encode an alphabet. Polybius (2nd century BC) suggested using two successive groups...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...

Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square Playfair Two-square Four-square Substitution Affine Atbash...