基于一种广义Lorenz-Stenflo超混沌系统的数字图像加密算法的性能研究

摘要

引入一种广义Lorenz-Stenflo超混沌系统到图像加密算法中,以提高图像加密的效果.图像加密采取了"置乱-扩散-置乱"的过程,首先将超混沌系统结合四阶龙格-库塔方程对图像进行离散并置乱,然后通过"异或"运算对图像进行扩散处理,最后通过二维Logistic混沌映射再进行置乱.通过仿真实验对图像加密性能进行测试,加密图像的相关指标参数NPCR,UACI和信息熵的测试结果都非常接近于理论值,表明:基于广义Lorenz-Stenflo超混沌系统的图像加密算法具有较强的鲁棒性,安全性可靠,可以有效地抵抗各种攻击.%A generalized Lorenz-Stenflo hyperchaotic system was introduced into image encryption algorithm to improve the effect of im -age encryption.The process of"scrambling-diffusion-scrambling"was taken for the image encryption.Ferstly,the hyper chaotic system was discreted for the image with four order Runge Kutta equation;and then the diffusion process on the image was carried out through the XOR operation;finally,the two-dimensional Logistic chaos mapping was adopted to scramble the the image again.The simulation experiment on image encryption was carried out in order to test the performance of the image encryption related parameters of NPCR, UACI and information entropy.The test results are very close to the theoretical value,and the image of the generalized Lorenz-Stenflo hyperchaotic system encryption algorithm has strong robustness based on safety and reliability,which can effectively resist all kinds of attacks.