About the book: 2002 / Interest in steganography has appeared in the last decade and is caused by the widespread use of multimedia technologies. Steganography methods allow not only to secretly transmit data, but also to solve problems of noise-resistant authentication, protecting information from unauthorized copying, tracking the dissemination of information over communication networks, and searching for information in multimedia databases. International symposia on data hiding have been held since 1996, the first symposium on steganography took place in July 2002. Steganography is a rapidly and dynamically developing science that uses methods and achievements of cryptography, digital signal processing, communication and information theory. Only a few review journal articles have been devoted to steganography in Russian. This book is intended to fill the existing gap. It summarizes the latest research results of foreign scientists. The book examines both theoretical and practical aspects of steganography, classifies stegosystems and embedding methods, examines in detail the issues of increasing the throughput of a stego channel, ensuring robustness and imperceptibility of embedding, and presents more than 50 data embedding algorithms. The book is intended for students, graduate students, researchers, students studying information security issues, as well as for engineers-designers of information security tools. It will also arouse undoubted interest among specialists in the field of information theory and digital signal processing..