Chaos-Based Encryption for Digital Images and Videos

Many digital services, such as pay-TV, confidential video conferencing, medical and military imaging systems, require reliable security in storage and transmission of digital images/videos.As the rapid progress of Internet in the digital world today, the security of digital images/videos has become more and more important.In recent years, more and more consumer electronic services and devices, such as mobile phones and PDA (personal digital assistant), have also started to provide additional functions of saving and exchanging multimedia messages.The prevalence of multimedia technology in our society has promoted digital images and videos to play a more significant role than the traditional dull texts, which demands a serious protection of users' privacy.To fulfill such security and privacy needs in various applications, encryption of images and videos is very important to frustrate malicious attacks from unauthorized parties.From early 1990s, many efforts have been made to investigate specific solutions to image/video encryption.Due to the tight relationship between chaos theory and cryptography, chaotic cryptography has also been extended to design image and video encryption schemes.This chapter focuses on different image/video encryption algorithms based on chaos, and clarifies some experiences, lessons and principles of using chaos to design such encryption schemes.To start, a comprehensive discussion on the state-of-the-art of image/video encryption will first be given as background and motivation for the discussion of the chapter.The organization of this chapter is as follows.In Sec.4.2, some preliminaries on image/video encryption are first given.Sec.4.3 is a comprehensive review on today's image/video encryption technology without using chaos theory.Chaos-based image and video encryption schemes are then surveyed in Sec.4.4.Some experiences, lessons and principles drawn from existing chaos-based image/video encryption algorithms are commented and discussed in Sec.4.5.The last section concludes the chapter. Image/