计算机科学 ›› 2022, Vol. 49 ›› Issue (1): 314-320.doi: 10.11896/jsjkx.201100089
梁剑, 何军辉
LIANG Jian, HE Jun-hui
摘要： 云存储的发展使人们愿意将个人视频数据传输至云端,但伴随而来的数据安全问题日益突出,选择加密是对视频进行隐私保护的有效手段之一。针对目前H.264/AVC视频选择加密方法普遍存在安全性不足的问题,文中提出了一种基于宏块编码信息自适应置换的H.264/AVC视频加密方法。该方法根据宏块的编码类型逐帧自适应生成伪随机序列,利用伪随机序列将宏块编码信息中的残差编码方案(Coded Block Pattern,CBP)和残差数据(Residual)在宏块间进行随机置换,同时还对I宏块的帧内预测模式以及P宏块与B宏块的运动向量差值的符号进行加密。实验结果表明,该方法可保证加密视频兼容H.264/AVC编码标准,并具有加密空间大、密钥敏感性好、视频码率变化小的特点。与现有的主流加密方案相比,所提方法在视觉安全性和抵抗最新提出的轮廓攻击方面表现更佳。
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