AI 中文总结
针对H.265/HEVC现有系数置乱加密方案的计算负载与安全缺陷，提出基于混沌映射的系数置乱方案，结合语法元素加密与AES-CTR序列，在低复杂度下提升安全性且片同步鲁棒。
AI 中文摘要
在当今数字环境中，高效视频编码标准H.265/HEVC已成为应用最广泛的视频编码标准，采用选择性加密方案在保持高效压缩性能的同时保护视频内容隐私。然而，现有的系数置乱方法会带来显著的计算负载，导致加密引起的比特率开销增加、执行时间延长，且安全措施不足。为解决这些问题，本文提出一种基于混沌映射的新型系数置乱方案。该方法利用混沌映射固有的伪随机性、遍历性和对初始条件的敏感性，生成高度不可预测的系数分布，从而在保持低复杂度的同时增强安全性。与传统置乱不同，混沌映射确保加密系数间的相关性最小，提升了抵御统计攻击和差分攻击的能力。此外，置乱条件经过专门设计，以最大程度降低对比特率开销的影响。进一步地，当结合包含运动矢量差（MVD）、量化变换系数（QTC）和亮度帧内预测模式（Luma IPM）的语法元素加密（SEC）时，该方法可有效扭曲视频内容。所提方案与片同步运行，确保即使部分片丢失，视频内容的解密仍保持完整。此外，将AES-CTR生成的随机序列与H.265编码流结合，以抵御选择明文攻击。
英文摘要
In today's digital landscape, high-efficiency video coding (H.265/HEVC) has emerged as the most widely used video coding standard, employing selective encryption schemes to protect the privacy of video content while maintaining efficient compression performance. However, existing coefficient scrambling methods impose a significant computational load, leading to increased bit rate overhead due to encryption, longer execution times, and insufficient safety measures. To address these issues, a new coefficient scrambling scheme based on \textit{chaotic maps} is proposed. This approach leverages the pseudorandomness, ergodicity, and sensitivity to initial conditions inherent in chaotic maps to generate highly unpredictable coefficient distributions, thereby strengthening security while preserving low complexity. Unlike conventional scrambling, chaotic maps ensure minimal correlation between encrypted coefficients, enhancing resistance against statistical and differential attacks. Additionally, the scrambling conditions are specifically designed to minimize the impact on the bit rate overhead. Furthermore, when combined with syntax element encryption (SEC), which includes motion vector difference (MVD), quantized transform coefficients (QTC), and luma intraprediction mode (Luma IPM), this method effectively distorts video content. The proposed scheme operates synchronously with slices, ensuring that the decryption of video content remains intact even if some slices are lost. Additionally, a random sequence generated by AES-CTR is incorporated with the H.265 encoded stream to protect against chosen-plaintext attacks.
Journal refIEEE Transactions on Circuits and Systems for Video Technology, vol. 36, no. 4, pp. 5655-5670, April 2026
DOI：10.1109/TCSVT.2025.3625077
