Unequal Video Encryption Scheme Based On H.264/AVC

With the development of computer and network technology, video applications also extend to all trades and professions. However, due to the openness of the Internet, video contents are vulnerable to targeted attacks and there are different requirements for security, real-time video transmission and computational cost in different applications. Meanwhile, the evaluation of a video imaging system is not just confined to the image quality, but the security level and additional features have also became important indicators. There are different requirements for security, real-time video transmission and computation complexity in different applications.In this paper, we propose the basic principle and technical features of H.264 standard, and focuing on the error resilience techniques for video transport technology based on H.264 standards. And through the analysis of current video encryption algorithm theory, this paper compared the encryption effects on the different points and coding efficiency during transmission, selected the best encryption region:which would be encrypted after entropy coding.In this paper, we also induced the stream cipher, studied the Salsa20 algorithm’ performances that is one of eSTREAM project winning algorithms, compared the current traditional encryption algorithm and improved Salsa20 algorithm. This improved algorithm became fast and had low calculation time delay. It is suitable for high throughput video image transport environments. While studies have shown that the Salsa20 algorithm is vulnerable to slide and differential attacks, due to its special iteration structure, but the current attack methods does not causing a real threat to high rounds Salsa20.Based on the above. In this paper, we propose an unequal video encryption scheme for H.264/AVC. According to the data importance, we classify the whole video data into different groups, then use AES and Salas20 algorithm to encrypt each groups separately.This scheme shall meet the application requirements in different security intensity levels.