光电工程, 2012, 39 (7): 126, 网络出版: 2012-08-02
随机振幅-相位编码虚拟光学加密系统
Virtual Optical Image Encryption Based on Random Amplitude-phase Encoding
图像加密 随机振幅 -相位编码 虚拟光学系统 盲反卷积 image encryption random amplitude-phase encoding virtue optical system blind deconvolution
摘要
通过对双随机相位编码光学加密系统中空域的随机相位模板进行置换,提出采用随机振幅 -相位模板对图像进行加密的新方法。理论分析表明,当随机振幅板为零均值白噪声且与频域相位板统计独立时,被加密图像的自相关函数为二维冲击函数,表明原始图像被加密为平稳的复随机白噪声,因而可以抵御盲反卷积攻击。采用计算机进行模拟,证实了所提方法的有效性。最后讨论了该方法相对于双随机相位编码系统的优越性:对空域密钥的统计学要求更低、在频域密钥泄露情况下系统鲁棒性更强。但是,由于物理上不存在幅度为负值的光波,因此该系统只能使用数字虚拟的方法来实现。
Abstract
A new optical encryption approach, named Random Amplitude-phase Encoding (RAPE), is proposed by replacing one of the random phase plates by random amplitude plate in the Double Random phase Encoding (DRPE) system. First of all, we calculate the autocorrelation function of the encoded image, which indicates that the original image has been transformed to complex-amplitude stationary white noise. So this method leads to robustness against blind deconvolution. Then, computer simulations are carried out and the validity of the method is verified. At last, compared with the DRPE, some properties of this method are discussed. RAPE scheme has lower requirements for secret keys and behaves more robustly against partial key exposure attack. Nevertheless, we also point out that this system could only be realized by virtual optics.
秦怡, 王红娟, 王丽, 杨兴强, 李根全. 随机振幅-相位编码虚拟光学加密系统[J]. 光电工程, 2012, 39(7): 126. QIN Yi, WANG Hong-juan, WANG Li, YANG Xing-qiang, LI Gen-quan. Virtual Optical Image Encryption Based on Random Amplitude-phase Encoding[J]. Opto-Electronic Engineering, 2012, 39(7): 126.