Even as late as 1915, the Caesar cipher was in use: the Russian army employed it as a replacement for more complicated ciphers which had proved to be too difficult for their troops to master; German and Austrian cryptanalysts had little difficulty in decrypting their messages.
Čak i kasnije (1915.), korištena je Cezarova šifra: Ruska vojska ju je koristila kao zamjenu za mnogo kompliciranije šifre koje su se kod njihovih trupa pokazale kao suviše teške za svladavanje - njemački i austrijski kriptoanalitičari su bez problema dekriptirali takve poruke.