HEVC Selective Encryption Using RC6 Block Cipher Technique

Abstract

The high efficiency video coding (HEVC) partial encryption (PE) technique depends on encrypting the highly sensitive data on the video bit stream. The HEVC PE technique should keep the video format compliance, should be of the same bit rate, and ensure real-time constraints. The paper suggests an effective RC6 HEVC PE technique which encrypts sensible video data bits with low complexity overhead, fast encoding time for real-time applications, and fixed HEVC bitrate. These features result from using the low computational complexity RC6 block cipher for encrypting the selective video bins. The proposed RC6 HEVC PE encrypts the discrete cosine transform (DCT) coefficients sign bit, the DCT remaining absolute values suffixes that are binarized by Exp-Golomb (EGk) order zero, the motion vector difference (MVD) sign bits, and MVD absolute values suffixes that are binarized by EGk order one. Also, this paper introduces experimental results that compare between the proposed RC6 HEVC PE and HEVC PE algorithms that use the Advanced Encryption Standard in different operation modes. This paper presents more details about the security analysis of RC6 HEVC PE including encryption quality test, key space test, statistical analysis such as histogram and correlation coefficient analysis, and sensitivity analysis such as the key sensitivity analysis. The achieved test results ensured and confirmed the security, reliability, and robustness of RC6 HEVC PE technique.