Cipher Pol in One Piece is a secretive intelligence agency under the World Government, with different levels like CP9 and CP0 ...

Below, we present three ciphers of different levels of difficulty, from easiest to most challenging. Cryptanalyst Jim Gillogly created them using the Playfair, Double Playfair, and Double ...

In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named ... If the two letters are in different rows and columns, take the letters in the opposite corners of their rectangle.