摘要： 提出一种基于四叉树结构的选择加密算法。对空域图像位平面采用四叉树编码，根据四叉树编码的结构特点对数据进行置乱和选择加密，对加密算法进行加密数据量分析和安全性评估。实验结果表明，该算法安全性较高，其空域图像的加密数据量为一般加密算法的50%左右。

关键词: 四叉树编码, 选择加密, 置乱

Abstract: This paper proposes a selective encryption algorithm based on quadtree structure. It encodes the bitplane of spatial domain image by quadtree encoded, shuffles and selectively encrypts the data according to the structure of quadtree encoding. The quantity of encrypted data and security of the algorithm is analyzed. Experimental results show that this algorithm has high security, and the quantity of encrypted data is only 50 percent of the normal encryption algorithm.

Key words: quadtree encoding, selective encryption, shuffle

中图分类号: 

• TP309