Steganography involves the art of concealing one message or data file within another. Stenographic technologies form an essential part of the future of internet privacy and security. This book emphasizes a novel field of study in steganography. They are the underlying science and art of communicating which keep the existence of the communication hidden. This book provides a broad overview of this technology by introducing distinct and latest concepts of steganography and steganalysis. The book also briefly covers the history of steganography and evaluates steganalysis methods considering their modeling techniques. It also presents some new steganography techniques for hiding secret data in images. The book also analyzes steganography in speeches and presents a new approach for concealing data in speeches.