Ciphers — Audiobooks
Mathematical Recreations and Essays
by W. W. Rouse (Walter William Rouse) Ball
Manual for the Solution of Military Ciphers
by Parker Hitt
La Cryptographie, ou, l'art d'écrire en chiffres
by P. L. Jacob
by W. W. Rouse (Walter William Rouse) Ball
by Parker Hitt
by P. L. Jacob