摘要： 提出一种基于混沌映射的图像加密算法，该算法对图像进行拉伸融合折叠变换，通过映射其矩阵的某行数据，得到修改Logistic映射初值的关键密钥m，并由2个Logistic混沌映射相结合产生加密序列，将图像与该序列进行相应代数运算，从而获得加密图像。理论分析和实验结果表明，该算法对密钥具有较强的敏感性，且加密图的像素值分布较均匀。

关键词: 混沌映射, Logistic序列, 图像加密, 敏感性

Abstract: This paper designs a new kind of image encryption algorithm which uses two Logistic systems. The auxiliary key m is obtained by a certain line data of the changed image matrix. The initial values of two Logistic mappings are modified by the key m. The Logistic mappings are used to generate the encryption sequences which are used to encrypt with every pixel of the image. Theoretical analysis and simulation results show the new algorithm not only has better sensitivity and very uniform pixel-value distribution, but also is simple and easy to achieve.

Key words: chaotic mapping, Logistic sequence, image encryption, sensibility

中图分类号: 

• TP309