文章摘要
徐扬,黄迎久,李海荣.一个切换Lorenz混沌系统在图像加密中的应用[J].包装工程,2018,39(5):179-184.
XU Yang,HUANG Ying-jiu,LI Hai-rong.Application of a Switched Lorenz Chaotic System in Image Encryption[J].Packaging Engineering,2018,39(5):179-184.
一个切换Lorenz混沌系统在图像加密中的应用
Application of a Switched Lorenz Chaotic System in Image Encryption
投稿时间:2017-06-12  修订日期:2018-03-10
DOI:10.19554/j.cnki.1001-3563.2018.05.034
中文关键词: 切换Lorenz混沌系统  图像加密  Arnold映射  Logistic映射
英文关键词: switched Lorenz chaotic system  image encryption  Arnold mapping  Logistic mapping
基金项目:内蒙古自治区自然科学基金(2017MS0604);内蒙古科技大学创新基金(2015XYPYL06)
作者单位
徐扬 内蒙古科技大学包头 014010 
黄迎久 内蒙古科技大学包头 014010 
李海荣 内蒙古科技大学包头 014010 
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中文摘要:
      目的 将一种新型的切换Lorenz混沌系统引入到图像加密系统中,以提高图像加密的效果。方法 图像加密系统采取“置乱-扩散-置乱-扩散”的过程,首先结合密钥K,将切换Lorenz混沌系统结合四阶龙格-库塔方程对明文图像进行离散,并通过Arnold映射对明文图像矩阵进行置乱;通过“异或”位运算对图像进行扩散处理;再通过Logistic映射对图像进行置乱;最后通过“循环移位”运算对图像进行扩散处理。结果 经过仿真实验对图像加密性能进行测试,密文图像的相关指标参数NPCR和UACI的测试值分别约为99.60和33.4,都很接近于它们的理论值,信息熵的测试结果约为7.997,也非常接近于理论值8。结论 表明引入新型切换Lorenz混沌系统的图像加密系统具有较强的鲁棒性、可靠的安全性,可以有效地提高加密系统的各种抗攻击能力。
英文摘要:
      The work aims to introduce a new type of switched Lorenz chaotic system into image encryption system to improve the effect of image encryption. When the image encryption system adopted the "scrambling-diffusion- scrambling -diffusion” process, firstly, combined with the key K, the switched Lorenz chaotic system was combined with four order Runge-Kutta equations to discretize the plain image, and the plain image matrix was scrambled through the Arnold mapping; the image was diffused through the bit "exclusive-OR" operation; and then the image was scrambled through the Logistic mapping; finally, the image was diffused through the "cyclic shift" operation. Through the simulation experiment to test the performance of image encryption, the test values of the encrypted image's related parameters NPCR and UACI were approximately 99.60 and 33.4, respectively, which were very close to the theoretical values. The information entropy test result was approximately 7.997, which was also very close to the theoretical value of 8. It is shown that the image encryption system with new switched Lorenz chaotic system has strong robustness and reliable security, and can effectively improve the anti-attack capability of the encryption system.
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