Real-Time Selective Video Encryption based on the Chaos System in Scalable HEVC Extension

International audienceIn this paper we propose a real-time selective video encryption solution in the scalable extension of High Effciency Video Coding(HEVC) standard, referred to as SHVC. The proposed scheme encrypts a set of sensitive SHVC parameters with a minimum delayand complexity overheads. The encryption process is performed at the CABAC binstring level and fulfils both constant bitrate andformat compliant video encryption requirements. In addition, it preserves all SHVC functionalities, including bitstream extractionfor mid-network adaptation and error resilience.We compare the performance of three selective SHVC encryption schemes: the first scheme encrypts only the lowest SHVC layer,the second encrypts all layers and the last scheme encrypts only the highest layer. The performance of the proposed schemes isassessed over different video encryption criteria, at different scalability configurations and various High Definition (HD) videosequences. Experimental results showed that encrypt only the lowest layer or all layers enables a high security level, while encryptingonly the highest layer leads to a perceptual encryption solution, by slightly decreasing the highest layer quality. Moreover, theprocessing complexity of the proposed solution is assessed in the context of a real-time SHVC decoder. The complexity overheadremains low and does not exceed 6% of the real-time decoding of SHVC video sequences