基于混沌及秘密共享的图像加密算法

根据混沌序列的伪随机性对初始条件与系统参数敏感的特性,采用映射得到混沌序列用于像素值的置换和像素点的置换;并将图像分为高位平面和低位平面,低位平面重新编码,高位平面经共享方案分存为几个影子平面,实现了共享方案中的无损共享.经过仿真实验,加密算法有较高的密钥敏感性,安全性和较好的加密效果.

Images Encryption Based on Chaos and Secret Sharing

The chaotic sequence is pseudo-random and sensitive to initial condition,system parameter.This paper first uses chaotic sequence generated by Logistic map to scramble image pixel values and pixels,then divides the image into high bit-planes and low bit-planes.It recodes the low bit-planes,and uses Thien-Lin sharing schemes to recode the high bit-plans which can achieve lossless sharing.After simulation experiments,the system has high sensitivity to initial conditions,better security and encryption effects.