Problem
Research questions and friction points this paper is trying to address.
coefficient scrambling
computational load
bit rate overhead
security
H.265/HEVC
Syntax Element Encryption for H.265/HEVC Using Chaotic Map-Based Coefficient Scrambling Scheme
🤖 AI Summary
该研究针对H.225/HEVC视频编码中现有系数混淆方法计算负担大、安全性不足的问题，提出了一种基于混沌映射的新系数混淆方案，结合语法元素加密，提高了安全性同时保持低复杂度。
📝 Abstract
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.
Innovation
Methods, ideas, or system contributions that make the work stand out.
chaotic maps
coefficient scrambling
syntax element encryption
bit rate overhead
security enhancement
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