One word is written along the left of the square, and the other is written along the top. The commonly used letters have only one value, the other letters two value. Tool to decrypt / encrypt with Vic. If the message is alphabetic, then convert it to numeric via the grid (row, column coordinates) otherwise skip this step, Example: The message DMPBDBFEU is then translated to 71505759842. The Vic cipher has several optional steps, depending on their application, the results may be different. It is really important for the mechanics of the cipher to work that the two numbers that are used to labe rows 3 and 4 are not given a letter in the top row. a bug ? The key can be bruteforced if it is short, the number of attempt is 10^(key size). Straddling Checkerboard Cryptography. 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. This cipher is similar to the Vigenère Autokey cipher, although it subtracts letters instead of adding them. We will convert the key DOCTOR to numbers using our checkerboard, and then add it to the plaintext, mod 10. What’s New. With this, we then look up each letter in the plaintext. If the message is numeric and without key, it contains 2 digits that have a higher occurrence frequency than the others (the 2 digits of the grid). The "a" is in the top row, so is only represented by a single digit "3". Vic encryption starts with the creation of a grid called Straddling Checkerboard generated from a deranged alphabet (see below on how to create it), Example: The following grid (with the numbers 2 and 6 and an upside-down deranged alphabet complemented by . Straddling Checkerboard Alphabet Digit 1 Digit 2 Parameters Without key With a numeric key. With this generated, we look at the first digit in the ciphertext. By choosing the wrong ones, he can head down a very wrong path, making this slightly more secure than the Polybius Square (as it is less susceptible to frequency analysis). The ten last digits were then used as header for a straddling checkerboard. The Nihilists cipher is a variant using an over-encryption of the Polybe code. Discussion Each letter is represented by its coordinates in the grid. Example: The alphabet AZERTYUIOPQSDFGHJKLMWXCVBN./ combined with the numbers 3 and 7 make it possible to create the grid. In terms of cryptanalysis, the fact that some letters are enciphered to single digits, whilst others are encrypted to pairs of digits, means that the cryptanalysist has to work out which are the single digits. First we need to generate the checkerboard, as below. The Polybius Square was not originally intended as a cipher in its own right, but rather an aid to telegraphy. The straddle checkerboard is a substitution cipher with variable length substitutions. 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