Polybius square example9/14/2023 ![]() ![]() If we use the English alphabet of 26 letters, we must combine 2 of the letters into one cell say, i and j (alternatively, in older versions of the square, k. This is a sign that youll need to use a Polybius Square. 55× square into which he inserted the 24 letters of the Greek alphabet. Example: AAABB AAABA ABBAB AAABB AABAA is equivalent to DCODE. Then replace each plaintext letter with the letter that forms the other corner of the rectangle that lies on the same row as that plaintext letter (being careful to maintain the order). Polybius was a Greek historian and cryptographer of the second century BC. Otherwise, form the rectangle for which the two plaintext letters are two opposit corners. ![]() If the two letters appear in the same column in the square, then replace each letter by the letter immediately below it in the square (cycling round to the top of the square if necessary).If the two letters appear on the same row in the square, then replace each letter by the letter immediately to the right of it in the square (cycling round to the left hand side if necessary).If the digraph consists of the same letter twice (or there is only one letter left by itself at the end of the plaintext) then insert the letter "X" between the same letters (or at the end), and then continue with the rest of the steps.You can use different grid such as 6圆, 7x7 and more but the commonly. How to use Polybius square We can use polybius square by simply creating a 5x5 grid that has a set of numbers and letters. On each digraph we peform the following encryption steps: Polybius square is also known as the Polybius Checkerboard is one of the cryptography invented by Polybious, an Ancient Greek historian and scholar. We must now split the plaintext up into digraphs (that is pairs of letters). ![]()
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