A review of selective H.264 video encryption techniques

Today, the transmission of video data with a huge size via limited bandwidth communication channels is considered a core challenge. Hence, the compression technology is widely used for video applications and one of the common efficient compression standards is H.264 that required to be protected. This paper focuses on classifying the selective video encryption techniques in terms of compression which is used for encrypted important or sensitive data on H.264 video using various encryption methods. The classification is consists of three classes: encryption before-compression, encryption during-compression, and encryption after-compression. Moreover, the H.264/AVC structure is explained in detail. The features for each class will be discussed for determining the open challenges in this approach. Finally, we concluded the review with open challenges and future directions. This review may help researchers and serve as a reference in the field of the selective H.264 video encryption system.