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首页> 外文会议>International Conference on Optics and Photonics 2015 >Double image encryption using gyrator wavelet transform
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Double image encryption using gyrator wavelet transform

机译：使用回旋小波变换的双图像加密

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摘要

In this paper, we implement a novel optical information processing tool termed as gyrator wavelet transform for the application of double image encryption using amplitude- and phase-truncation approach. This approach enhances the key space in an asymmetric cryptosystem by adding supplementary security layers, i.e., family of mother wavelet and the gyrator transform order. Double input images bonded with random phase masks are independently gyrator transformed. Amplitude truncation of obtained spectrum generates individual and universal keys while phase truncation generates two real-valued functions. Each of the retrieved amplitude function is discrete wavelet transformed, which results into four different frequency bands. We have fused the obtained wavelet spectrum of an individual image by again gyrator transforming them following amplitude- and phase truncation. The obtained real-valued functions corresponding to each image are bonded to form the encrypted image. After using the correct universal key, individual asymmetric key, type of wavelet, and correct gyrator transform order, the original images are retrieved successfully. Numerical simulation results prove that the proposed scheme is more flexible and effective than existing wavelet fusion schemes.
机译：在本文中，我们实现了一种新颖的光学信息处理工具，称为回旋小波变换，用于使用幅度和相位截断方法进行双重图像加密的应用。这种方法通过增加补充安全层，即母子波族和回旋器变换顺序，来增强非对称密码系统中的密钥空间。与随机相位掩膜结合的双输入图像被独立地经陀螺仪变换。所获得频谱的幅度截断产生单个和通用密钥，而相位截断产生两个实值函数。每个检索到的振幅函数都是离散小波变换的，其结果是形成四个不同的频带。我们通过在振幅和相位被截断后再次进行回转器对它们进行变换来融合获得的单个图像的小波频谱。所获得的与每个图像相对应的实值函数被结合以形成加密图像。使用正确的通用密钥，单个非对称密钥，小波类型和正确的回转器变换顺序后，可以成功检索原始图像。数值仿真结果表明，该方案比现有的小波融合方案更具灵活性和有效性。

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