基于改进广义Arnold映射的多混沌图像加密算法
发布时间：2019-06-26 14:24
【摘要】：目的针对Arnold映射图像置乱效果差以及无法抵御选择明文攻击等问题,提出一种改进广义Arnold映射的图像加密算法,以提高密文图像的安全性。方法该算法引入Kent映射产生控制参数,先对图像进行分块来削弱图像的相关性,对每块图像进行Arnold映射位置置乱,然后利用二维logistic映射生成混沌序列,经双曲正切变换处理后按照奇偶序列与置乱图像进行异或运算,得到最终密文图像。结果该算法得到密图信息熵为7.9899,像素改变率为99.61%,统一平均变化程度为30.73%。结论该算法简单易执行,能有效抵御各种统计攻击和明文攻击,具有密钥空间大、置乱效果好、鲁棒性较强等特点。
[Abstract]:Aim to solve the problems of poor scrambling effect of Arnold mapping image and unable to resist the attack of selected plaintext, an improved image encryption algorithm based on generalized Arnold mapping is proposed to improve the security of ciphertext image. Methods the algorithm introduces Kent mapping to generate control parameters. Firstly, the image is divided into blocks to weaken the correlation of the image, and then the Arnold mapping position of each image is scrambled. Then the chaotic sequence is generated by two-dimensional logistic mapping. After hyperbolic tangent transformation, the XOR operation is carried out according to the odd-even sequence and the scrambled image, and the final ciphertext image is obtained. Results the information entropy of dense graph was 7.9899, the pixel change rate was 99.61%, and the unified average change degree was 30.73%. Conclusion the algorithm is simple and easy to execute, and can effectively resist all kinds of statistical attacks and plaintext attacks. It has the characteristics of large key space, good scrambling effect and strong robustness.
【作者单位】： 南京信息工程大学电子与信息工程学院;南京信息工程大学大气环境与装备技术协同创新中心;
【基金】：江苏省第十一批“六大人才高峰”高层次人才项目 江苏高校优势学科Ⅱ期建设工程项目
【分类号】：TP309.7;TP391.41
[Abstract]:Aim to solve the problems of poor scrambling effect of Arnold mapping image and unable to resist the attack of selected plaintext, an improved image encryption algorithm based on generalized Arnold mapping is proposed to improve the security of ciphertext image. Methods the algorithm introduces Kent mapping to generate control parameters. Firstly, the image is divided into blocks to weaken the correlation of the image, and then the Arnold mapping position of each image is scrambled. Then the chaotic sequence is generated by two-dimensional logistic mapping. After hyperbolic tangent transformation, the XOR operation is carried out according to the odd-even sequence and the scrambled image, and the final ciphertext image is obtained. Results the information entropy of dense graph was 7.9899, the pixel change rate was 99.61%, and the unified average change degree was 30.73%. Conclusion the algorithm is simple and easy to execute, and can effectively resist all kinds of statistical attacks and plaintext attacks. It has the characteristics of large key space, good scrambling effect and strong robustness.
【作者单位】： 南京信息工程大学电子与信息工程学院;南京信息工程大学大气环境与装备技术协同创新中心;
【基金】：江苏省第十一批“六大人才高峰”高层次人才项目 江苏高校优势学科Ⅱ期建设工程项目
【分类号】：TP309.7;TP391.41
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