Image Encryption Based on Block-wise Fractional Fourier Transform with Wavelet Transform
Bhaskar Panna, Sumit Kumar, Rajib Kumar Jha · IETE Technical Review · 2018
In the era of multimedia, images excessively present a backbone of communication. When images are transferred over an unsecured network, then the confidentiality of information is a big challenge to us. Encryption is a way to maintain the secrecy of information of the images. Here, in this paper, we propose a new method of image encryption using block-wise fractional Fourier transform (FRFT) with the subsequent use of discrete wavelet transform. The FRFT has been applied to the four non-overlapping blocks of the different planes (R, G, and B) of the image. The proposed method gives high security as it is quite difficult to decrypt the image without knowing the proper keys. The computer simulations of the algorithm have been carried out to verify the effectiveness of the proposed method. Different quantitative parameters have also been discussed in order to compare the proposed method with state-of-the-art methods and it has been found that our proposed method gives better or comparable results.