With the permeation of scalable video encoding ( SVC) , security problems pertinent to scalable video attract growing attention too. Most of the existing encryption algorithms are designed for H. 264/AVC standard, which are not suitable to scalable video encoding. And in this paper we analyse the new use of the techniques of SVC, and take the lead in proposing a new stratified encryption scheme in light of its characteristics. The scheme chooses some key video information different from the usual ones as the objects to encrypt, such as the motion vector of inter-layer prediction and the key frames with SNR scalability,etc. The algorithm is designed according to the types of the information chosen and in combination with the security level the users required. Experimental results show that the new scheme has the advantages in better encryption effect, smaller key volume and higher real-time, and can fit application occasions with different security requirements.%随着可伸缩视频编码SVC( Scalable Video Coding)的普及,针对可伸缩视频的安全问题也越来越受到重视.目前大部分加密方案都是针对H.264/AVC编码标准来设计的.分析SVC新采用的技术,并率先提出了一种针对其特点的新的分层加密方案.该方案选取不同以往的视频关键信息,如层间预测运动向量,质量可分级关键帧等作为加密对象,根据所选信息的类型,结合用户所需求的安全等级,进行算法设计.试验结果表明该方案具有加密效果好、密钥量较低、实时性高等优点,并可以适应不同安全性需求的应用场合.
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