Ciphers — Audiobooks

La Cryptographie, ou, l'art d'écrire en chiffres

La Cryptographie, ou, l'art d'écrire en chiffres

by P. L. Jacob

Manual for the Solution of Military Ciphers

Manual for the Solution of Military Ciphers

by Parker Hitt

Elementary cryptanalysis

Elementary cryptanalysis

by Helen Fouché Gaines