双向螺旋与比特变换的混沌图像安全算法研究
Research on chaos image safety algorithm of two-way spiral and bit transformation
喻君婕 1巫朝霞1
作者信息
- 1. 新疆财经大学,新疆乌鲁木齐 830012
- 折叠
摘要
[目的/意义]针对现有图像安全算法中存在着密钥空间小、模型非线性复杂度过高等问题,提出一种将双向螺旋变换、比特变换和三维三角函数混沌系统结合的图像加密算法,并对算法的安全性进行分析.[方法/过程]首先,对输入图像进行双螺旋变换,起始点在Henon混沌映射的控制下随机选择,在通过顺时针扫描得到第一个序列后,再通过逆时针扫描得到第二个序列,将两个序列连接并重新排列为原始图像大小的置乱矩阵.其次,通过三维三角函数混沌系统生成的混沌序列与置乱矩阵进行异或运算,进一步得到中间密文图像.最后,对中间密文图像进行比特分解,对第8阶比特平面进行行列索引置乱,得到最终的密文图像.[结果/结论]仿真实验结果表明,所提出的算法具有良好的加密效果,密文图像的相邻像素相关性更低,安全性较强,并且具有良好的抗噪声攻击和抗剪切攻击的性能.
Abstract
[Purpose/Significance]For the existing image security algorithm,the key space in the image security algorithm,the non-linear complexity of the model is too high.A image encryption algorithm combined with two-way spiral transformation,bit transformation,and three-dimensional triangle function chaos system,and analyzed the security of the algorithm.[Method/Process]First of all,the input image is used for dual spiral changes.The starting point is randomly selected under the control of the Henon chaos mapping.First scan the first sequence through clockwise scanning,and then the second sequence is obtained through counterclockwise scanning.Arrived into a random matrix of the original image size.The chaotic sequence generated by the chaos system generated by the three-dimensional triangle function is different or operational to further obtain the middle cipher-text image.Finally,the middle cipher-text image was decomposed,and the eighth-order Bit plane was indexed to disrupt the final cipher image.[Results/Conclusion]Simulation experimental results show that the proposed algorithm has good encryption effect,lower correlation of neighbouring pixels of the ciphertext image,stronger security,and good resistance to noise attack and shear attack.
关键词
图像加密/混沌系统/双向理论/比特变换/安全分析/信息安全Key words
image encryption/chaos system/two-way spiral/bit transformation/information security引用本文复制引用
基金项目
国家自然科学基金资助项目(61941205)
出版年
2024
NETL
NSTL
万方数据