(28-05-2023, 07:09 PM)davidjackson wrote: You are not allowed to view links. Register or Login to view.A similar system is the Rossinols "Grand Cipher" in use in French administration during the 18th century, although I suspect this is not nearly as sophisticated as the G.C.
Do you really mean such a system ?
Quote:Rossignol, however, developed a coding system in which syllables and whole words were also replaced by numbers ....... Decryption was only possible with code tables on which the word - arranged in alphabetical order - and the corresponding numerical value were recorded.
After all, a cryptanalyst succeeded in deciphering it in 1893. He guessed that a particular sequence of repeated numbers, 124-22-125-46-345, stood for les ennemis ("the enemies") and from that information was able to unravel the entire cipher.