摘要：

针对图像加密在信息封装过程中存在容量小的问题,提出一种基于最高有效位(MSB)的大容量可逆数据加密方法。通过构建分段线性混沌图加密方式,进行数据封装和可逆数据重建。给出一种预测误差修正方法,构建加密数据误差的二进制图实现对加密过程的修复,以提高加密数据的重建质量。选取眼睛、身体和脑部 3幅CT图像进行仿真,结果表明,该算法在水平和垂直相关系数等6项指标上优于块混淆和多级扩散的图像加密算法。

关键词: 分段线性, 混沌图, 最高有效位, 可逆, 大容量, 数据加密

Abstract: Aiming at the problem that image encryption has small capacity in information encapsulation process,a large-capacity reversible data encryption method based on the Most Significant Bit (MSB) is proposed.Data encapsulation and reversible data reconstruction are realized by constructing a piecewise linear chaotic map encryption method.A prediction error correction method is proposed.By using the binary graph of the error of the encrypted data,the encryption process is repaired and the reconstruction quality of the encrypted data is improved.The simulation results on selected CT images of eyes,body and brain show that the proposed algorithm is superior to the block-based confusion and multiple levels of diffusion algorithm in six indicators,such as horizontal and vertical correlation coefficients.

Key words: piecewise linear, chaotic map, Most Significant Bit (MSB), reversibility, large capacity, data encryption

中图分类号: 

• TP391