Chaotic Video Encryption Algorithm Based on Baker Map

With the increase of Internet bandwidth,applications based on video stream have been developed rapidly.Butthe applications,such as digital video,video mail or videophone,are very vulnerable in network environment.Thereforevideo security has become an important research field.In recent years,a lot of image and video encryption algorithms andtechniques have been used to solve the problem.However,most of them have drawbacks in security or speed.Combiningwith other algorithms’virtues,this article puts forward a method that uses both stream ciphers to generate pseudo-randomnumbers and block ciphers to do permutation.A4-dimensional hyperchaotic function is chosen as stream ciphers,and Bak-er map as block ciphers.The improved Baker map can withstand known-plaintext attack in simple form.And the 4-dimen-sional hyperchaotic function can not only enhance encryption speed but also increase cipher complexity.This method,which can be simply realized by software,is independent of any kind of video compression algorithms,while providing highsecurity for real-time digital video with fast encryption speed.