A Colour Video Encryption Scheme Based on Chaotic Maps

Abstract

The development of wireless and mobile communications has led to the expansion of digital multimedia  (video and image) exchange over computer  networks. So, there is a need to protect video content  in many digital applications such as confidential video conferencing, medical  imaging  systems  and  payTV, etc. Video encryption is widely used as a way to provide security  for digital video. In this paper, we introduce a secure scheme for colour video encryption  using chaotic maps. Video encryption divides the file into  a group of images called frames, and then  the video encryption  process goes through five stages: shuffle the video frames, permutation, confusion,  diffusion on frame level and diffusion on video space components level. The proposed scheme uses four chaotic maps to shuffle, permutation, confuse, and  diffuse the video frames. It also uses two other chaotic maps to initialize  and  control the above chaotic  maps. The key space of our scheme is 2¹²⁸ which makes  the brute  force attack  impracticable. To analyze security and robustness of the proposed scheme, several security tests are used such as peak signal-to-noise  ratio (PSNR), signal to noise ratio (SNR), histogram analysis, correlation coefficient analysis, information entropy, differential attacks, keyspace, and key sensitivity. The results  of the different  types of analyses  indicate that  the proposed video encryption  scheme has high sensitivity  and security.