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clunky_vigenere

  • Count all trigrams
  • Count the steps in between all reoccurring same trigrams
  • Calculate the GCD of steps between each reoccurring trigrams
  • The most frequently occurring GCD is likely the key length of the cryptogram.
  • Spit up the string by every nth (in authors case 4th character)
  • Calculate the frequency of the letters
  • Calculate the Index of coincidence of each string
  • Iterate over every letter of the English alphabet and compare the mutual index between strings “a,b”, where the second string “b” is decrypted with each letter of iterated English alphabet.
  • If the mutual index of coincidence is relatively high, then there is a strong chance that the according shift between key letters for first and second line have a correct distance in between them.

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