抗攻击能力强的光学图像加密系统设计

Design of optical image encryption system with strong anti attack ability

针对加密后的光学图像在不同条件下被攻击后均可在一定程度内复原初始光学图像,且复原图像内包含较多初始光学图像信息的问题,设计抗攻击能力强的光学图像加密系统。加密时,将加密光学图像和两个相对称相位秘钥进行融合,通过傅里叶变换得到加密后的光学图像;解密时,获取加密光学图像的光场分布,通过傅里叶变换处理光场分布后得到解密光学图像,最后进行了光学图像加密系统的性能测试,结果表明,该系统能够有效实现光学图像加密,进而使攻击者无法获取原始光学图像中任何信息,解密后各类光学图像的峰值信噪比和结构一致度分别达到30 dB和0.8以上。

Aiming at the problem that the encrypted optical image can be restored to a certain extent after being attacked under different conditions,and the restored image contains more information of the initial optical image,an optical image encryption system with strong anti-attack ability is designed.In encryption,the encrypted optical image is fused with two symmetric phase secret keys,and the encrypted optical image is obtained by Fourier transform;At last,the performance of the optical image encryption system is tested.The results show that the system can effectively realize the optical image encryption,and the attacker can not obtain any information in the original optical image.After decryption,the peak signal-to-noise ratio and the structure consistency of all kinds of optical images are above 30 dB and 0.8 respectively.