基于视觉关联的数字图像置乱加密方法

Digital Image Scrambling Encryption Method Based on Visual Association

针对现有数字图像加密方法存在的加密效果差、加密时间长、抗攻击能力弱等问题,提出基于视觉关联的数字图像置乱加密方法。应用小波变换原理提取数字图像视觉关联信息—纹理特征信息,以此为基础,结合内部与外部密钥在Henon与Logistic映射算法的共同应用下,生成数字图像密钥,融合分层旋转置乱方式与循环移动置乱方式制定数字图像置乱规则。基于密钥与置乱规则编制数字图像置乱加密与解密程序,执行程序即可实现数字图像的置乱加密与解密。实验结果显示:提出方法应用后加密图像不动点比最小值为4.12%,数字图像加密平均时间最小值为0.89s/幅,置乱加密数字图像密钥破解比例为4%。

Aiming at the problems of the existing digital image encryption methods,such as poor encryption effect,long encryption time and weak anti-attack ability,a digital image scrambling encryption method based on visual association is proposed.Using the principle of wavelet transform to extract the visual association information-texture feature information of digital images,based on this,the digital image key is generated by combining internal and external keys with the application of Henon and Logistic mapping algorithms,and the digital image scrambling rules are established by integrating the hierarchical rotation scrambling mode and the cyclic moving scrambling mode.Digital image scrambling encryption and decryption program are programmed based on key and scrambling rules,which can be realized by executing the program.The experimental results show that the minimum fixed point ratio of the encrypted image is 4.12%,the minimum average time of digital image encryption is 0.89s/frame,and the decoding ratio of scrambled digital image key is 4%.