Incoming Resources
- Manual of cryptography, by General Luigi Sacco ; translated from the original "Manuale di crittografia."
- Statistical methods in cryptanalysis, [with (new added) problems for the student], Solomon Kullback
- The mathematics of secrets, cryptography from Caesar ciphers to digital encryption, Joshua Holden
- The book of codes, understanding the world of hidden messages : an illustrated guide to signs, symbols, ciphers, and secret languages, Paul Lunde, general editor
- Secret language, Barry J. Blake