Reply To: HELP 10B – HOW DO YOU DO THE TRANSPOSITION

Harry, please feel free to edit and remove whatever feels necessary.
@Meera so, the first thing we know is that the 3 needle telegraph is used during the encryption process. This tells that one of each character will be needed per trigram. What you can then do is realise that in every group [of the right size – Harry edit] (I think i’ve seen this written in forums) there is the same number of each character. This says that the key length of the transposition is most likely a factor of [that size – another edit]. If you look at the current trigram state, they do not contain one of each character yet so a length of 3 is not an option, so you just need to check [the other factors – and another Harry edit]. Next, you want to apply Harry’s favourite transposition method that has been used before with the criteria that each trigram is made of 1 of each character.

Little extra tip: There is only one key that works

Hope this helps