![]() ![]() Each square is used in turn to encipher 5 plaintext letters. Row two is then shifted down a row at a time to form squares 6, 7 and 8. The Polybius square or Polybius checkerboard is a method for fractionating plaintext characters so that they can be represented by a smaller set of symbols. 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). Starting with a basic 5x5 Polybius square (1 below), the first row is shifted down one row at a time form squares 2, 3, 4 and 5. ![]()
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