Reply To: Challenge 8B – Hints

… I forgot to add, to save unnecessary effort, check the Index Of Coincidence before you run the Polybius or Substitution decrypt. (What this is and how to do it is in the training manuals, although if you probably know it by now with all the Vigenere challenges.) If it’s not close to normal, there’s no point trying the decrypt, you haven’t yet manipulated the numbers correctly. Good luck!