Xu Hui, Tong Xiao-Jun, Zhang Miao, Wang Zhu, Li Ling-Hao
J Opt Soc Am A Opt Image Sci Vis. 2016 Jun 1;33(6):1166-74. doi: 10.1364/JOSAA.33.001166.
Video encryption schemes mostly employ the selective encryption method to encrypt parts of important and sensitive video information, aiming to ensure the real-time performance and encryption efficiency. The classic block cipher is not applicable to video encryption due to the high computational overhead. In this paper, we propose the encryption selection control module to encrypt video syntax elements dynamically which is controlled by the chaotic pseudorandom sequence. A novel spatiotemporal chaos system and binarization method is used to generate a key stream for encrypting the chosen syntax elements. The proposed scheme enhances the resistance against attacks through the dynamic encryption process and high-security stream cipher. Experimental results show that the proposed method exhibits high security and high efficiency with little effect on the compression ratio and time cost.
视频加密方案大多采用选择性加密方法对部分重要且敏感的视频信息进行加密，旨在确保实时性能和加密效率。由于计算开销大，经典分组密码不适用于视频加密。在本文中，我们提出了加密选择控制模块，由混沌伪随机序列控制动态加密视频语法元素。一种新颖的时空混沌系统和二值化方法被用于生成密钥流，以加密所选的语法元素。所提出的方案通过动态加密过程和高安全性的流密码增强了抗攻击能力。实验结果表明，该方法具有高安全性和高效率，对压缩比和时间成本影响很小。
