Abstract: A format-compliant selective encryption algorithm for MPEG-4 video data is more practical comparing with its counterpart, but no selective encryption algorithm compliant with JPEG is proposed. Several basic techniques for JPEG-compliant selective encryption algorithm based on Coupled Map Lattice(CML) are proposed and some modifications are given. This paper analyzes the security of the algorithm. Experimental results show that the algorithm for JPEG has high practical value.

Key words: selective encryption, format compliance, chaos, Coupled Map Lattice(CML)

摘要： 保持MPEG-4视频格式兼容的选择加密算法有很多应用优势，但并不适用于JPEG图像。该文基于耦合映像格子系统，提出几种保持JPEG格式兼容的基本加密技术，并对其进行改进。分析改进后算法的安全性。实验结果证明，该算法对JPEG图像编码加密具有较高的实用价值。

关键词: 选择加密, 格式兼容, 混沌, 耦合映像格子

CLC Number: 

• TP309