安全鲁棒的HEVC视频隐写关键技术研究

随着高性能视频编码和通信网络的快速发展，以HEVC视频为载体的通信越来越具有普遍性与频发性，这为隐写提供了更多的安全隐蔽信道。本项目结合HEVC编码新机制，围绕提升视频隐写的安全性、隐蔽性、以及鲁棒性开展研究，主要内容包括：1)从预测模式统计差异、预测模式转移概率等新角度设计隐写方法，并借助空间几何原理进行修正，提高预测模式域隐写的安全性和嵌入载荷；2)研究HEVC编码中残差系数的统计特性，在补偿性原则下定义联合失真函数，构建基于新失真函数的高效隐写编码，并结合失真漂移补偿机制、视频转码下的鲁棒性增强策略，提出兼具强隐蔽性与鲁棒性的隐写方法；3)从抗高维特征隐写分析、基于网络大数据载体被动攻击、隐写与隐写分析的博弈对抗等多个维度，提出视频隐写安全性评价体系。本项目的研究将为HEVC视频隐写提供新思路和技术基础，研究成果可应用于保密通信和数字作品内容认证等领域。

With the rapid development of high-performance video coding and communication networks, HEVC video as the carrier of communication is becoming more and more universal and frequent, which provides more secure covert channels for steganography. Considering the new mechanism of HEVC video coding, the project focuses on improving the security, undetectability, and robustness of steganography. The main contents include: 1) The steganography scheme is designed from the new perspectives of statistical difference and transfer probability of prediction modes. The security and embedding capacity of steganography in prediction mode domain are improved by means of spatial geometric principle. 2) The statistical characteristics of residual coefficients in HEVC coding are studied, and the joint distortion function under the principle of compensation is defined. Then an efficient steganographic coding based on the new distortion function is constructed. Combined with the distortion drift compensation mechanism and the robustness enhancement strategy under video transcoding, the steganography methods with strong concealment and robustness will be designed. 3) From the perspectives of resisting high-dimensional feature steganalysis, passive attacks based on big data carriers, game confrontation between steganography and steganalysis, the security evaluation method is proposed to expand the security evaluation system of video steganography. The project will provide new ideas and technical foundation for HEVC video steganography. The research results can be applied to secure covert communication and content authentication of digital works.