The proposed work describes optical transformations such as Fourier transformation and Fresnel transformation based
encryption and decryption of images using random phase masks (RPMs). The encrypted images have been embedded in
some secret cover files of other formats like text files, word files, audio files etc to increase the robustness in the security
applications. So, if any one wants to send confidential documents, it will be difficult for the interloper to unhide the
secret information. The whole work has been done in MATLAB®
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