Color image encryption and decryption for twin images in fractional Fourier domain
Color image encryption and decryption for twin images in fractional Fourier domain
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DOI：
10.1016/j.optcom.2008.08.024
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发表时间：
2008-12
影响因子：
2.4
通讯作者：
Madhusudan Joshi;Chandrashakher;Kehar Singh
中科院分区：
文献类型：
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作者：
Madhusudan Joshi;Chandrashakher;Kehar Singh
提出了一种基于分数阶傅里叶变换的双色图像加密方法。将待加密的彩色图像转换为索引图像格式，然后通过基于FRT的孪生图像加密算法进行处理。该算法在图像域使用一个随机码，在FRT域使用一个随机相位码，实现图像的双重加密。将两个输入RGB图像转换为它们的索引格式有助于对每个图像进行单通道处理，并且与多通道技术相比更加紧凑和鲁棒。不同的分数阶，在图像和FRT域的随机掩码是关键，以提高该系统的安全性。讨论了实现所提出的加密和解密方案的算法，并给出了数字仿真结果。我们研究了所提出的方案对使用未经授权的密钥（例如，不正确的分数阶，不正确的随机相位掩模等）的敏感性。文中还讨论了该方法对遮挡和噪声的鲁棒性。
We propose a method for the encryption of twin color images using fractional Fourier transform (FRT). The color images to be encrypted are converted into the indexed image formats before being processed through twin image encryption algorithm based on the FRT. The proposed algorithm uses one random code in the image domain and one random phase code in the FRT domain to perform double image encryption. The conversion of both the input RGB images into their indexed formats facilitates single-channel processing for each image, and is more compact and robust as compared to multichannel techniques. Different fractional orders, the random masks in image- and FRT domain are the keys to enhance the security of the proposed system. The algorithms to implement the proposed encryption and decryption schemes are discussed, and results of digital simulation are presented. We examine sensitivity of the proposed scheme against the use of unauthorized keys (e.g. incorrect fractional orders, incorrect random phase mask etc.). Robustness of the method against occlusion and noise has also been discussed.