Explains exactly what steganography is-hiding a message inside an innocuous picture or music file-and how it has become a popular tool for secretly sending and receiving messages for both the good guys and the bad guysFirst book to describe international terrorists" cybersecurity tool of choice in an accessible languageAuthor is a top security consultant for the CIA and provides gripping stories that show how steganography worksAppendix provides tools to help people detect and counteract stenanography