Verne had come across the idea in Fleissner's treatise Handbuch der Kryptographie which appeared in 1881. Fleissner Grilles were constructed in various...

encourage research on the double transposition cipher, Leiberich suggested during his retirement in 1999, that a double transposition challenge be published. Leiberich's...

Force Weather Service The device made the solutions of a single transposition (Transposition cipher) easy. A message being studied must be broken into likely...