Jennifer MacKay 
Cryptology [PDF ebook] 

Cryptology has long been employed by governments, militaries, and businesses to protect private communications. This anthology provides readers with a revealing look into the world of cryptology. The techniques used to disguise messages are explained, as well as the methods used to crack the codes and ciphers of encrypted messages. Readers will discover how cutting edge forensic science reveals the clues in the tiniest bits of evidence. A fact versus fiction section helps keep concepts rooted in known truths.