Codes and Ciphers: Julius Caesar, the Enigma, and the Internet
"He has written an excellent book that belongs in your personal library."    Cryptologia"Churchhouse (emer., Cardiff Univ., Wales) offers a history and explanation of codes, ciphers, cryptography, and cryptanalysis from Julius Caesar and WWII code-breaking activities to the present day including the world of the Internet. It makes for a most exciting read... An excellent resource to support introductory courses in cryptography or crypt-analysis."   Choice