摘要
针对传统混沌加密算法存在的混沌周期性以及仅可应用于方形密文的局限性,研究二值图像混沌加密算法。采用基于循环位移的图像置乱算法,利用基于像素扩散机制的图像加密算法,通过Logistic映射的迭代输出密钥模型以及Tent映射,设计非周期性的像素扩散函数改变置乱图像像素灰度值,实现置乱后的二值图像加密,并利用单调抑制模型增强二值图像映射输出序列随机性,提高二值图像加密效果。实验结果表明:本文算法在二值图像加密中的应用具有显著优势。
In view of the chaos periodicity of traditional chaotic encryption algorithm and the limitation that it can only be applied to square ciphertext, the binary image chaotic encryption algorithm is studied. The image scrambling algorithm based on cyclic displacement is adopted. The binary image is scanned by row and column by using different chaotic equations. The scrambling image is obtained and the spatial position of image pixels is changed. The image encryption algorithm based on pixel diffusion mechanism is used and the logistic algorithm is used. The iterative output key model of mapping and tent mapping are used to design the aperiodic pixel diffusion function to change the gray value of scrambled image, and realize the encryption of binary image after scrambling. The monotone suppression model is used to enhance the randomness of the output sequence of binary image mapping and improve the encryption effect of binary image. The experimental results show that this algorithm has significant advantages in the application of binary image encryption.
作者
袁伟伟
张翠翠
YUAN Wei-wei;ZHANG Cui-cui(Jiangsu College of Nursing,Huaian 223005 China;Kaiming Middle School,Huaian 223300 China)
出处
《自动化技术与应用》
2022年第1期87-90,115,共5页
Techniques of Automation and Applications
基金
江苏省教育厅项目(2017SJB2012)。
关键词
循环位移
二值图像
混沌加密
扩散机制
抗差分攻击性
密钥
cyclic displacement
binary image
chaotic encryption
diffusion mechanism
anti differential attack
key
