Extended Selective Encryption of H.264/AVC (CABAC)- and HEVC-Encoded Video Streams
Extended Selective Encryption of H.264/AVC (CABAC)- and HEVC-Encoded Video Streams
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DOI：
10.1109/tcsvt.2015.2511879
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发表时间：
2017-04-01
影响因子：
8.4
通讯作者：
Dufaux, Frederic
中科院分区：
文献类型：
--
作者：
Boyadjis, Benoit;Bergeron, Cyril;Dufaux, Frederic
针对H.264/高级视频编码（AVC） （CABAC）和高效视频编码（HEVC）流，本文提出了一种扩展的选择性加密（SE）方法，解决了H.264/高级视频编码（AVC） （CABAC）和高效视频编码（HEVC）流的选择性加密（SE）所面临的主要安全问题：内容保护，这与通过受保护视频泄露的信息量有关。我们的贡献是改善了由SE方法引起的视觉畸变。先前在H.264/AVC （CABAC）和HEVC上的工作都将加密限制在由CABAC的一种特定模式（其旁路模式）处理的箱中，这种模式具有保留总比特率的优点，我们在这里建议也依赖于更广泛使用的CABAC模式（其常规模式）的加密。这允许一个主要码字的加密视频重建，预测模式内块/单元。干扰它们的统计数据可能会导致比特率开销，这是改进SE方法的内容安全级别的代价。本文对提高加扰效率与不良后果之间的折衷进行了全面的研究，并对所提出的CABAC正则模式加密进行了具体的安全性分析。
This paper proposes an extended selective encryption (SE) method for both H.264/advanced video coding (AVC) (CABAC) and High Efficiency Video Coding (HEVC) streams, addressing the main security issue that SE is facing: content protection, related to the amount of information leakage through a protected video. Our contribution is the improvement in the visual distortion induced by SE approaches. Previous works on both H.264/AVC (CABAC) and HEVC limit encryption to bins treated by one specific mode of CABAC-its bypass mode-which has the advantage of preserving the overall bitrate, we propose here to also rely on the encryption of the more widely used mode of CABAC-its regular mode. This allows encryption of a major codeword for video reconstruction, the prediction modes for intra blocks/units. Disturbing their statistics may cause bitrate overhead, which is the tradeoff for improving the content security level of the SE approach. A comprehensive study of this compromise between the improvement in the scrambling efficiency and the undesirable aftereffects is presented in this paper, and a specific security analysis of the proposed CABAC regular mode encryption is conducted.