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Cryptosystem for Securing Image Encryption Using Structured Phase Masks in Fresnel Wavelet Transform Domain

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Abstract

A cryptosystem for securing image encryption is considered by using double random phase encoding in Fresnel wavelet transform (FWT) domain. Random phase masks (RPMs) and structured phase masks (SPMs) based on devil’s vortex toroidal lens (DVTL) are used in spatial as well as in Fourier planes. The images to be encrypted are first Fresnel transformed and then single-level discrete wavelet transform (DWT) is apply to decompose \(LL,HL, LH\) and \(HH\) matrices. The resulting matrices from the DWT are multiplied by additional RPMs and the resultants are subjected to inverse DWT for the encrypted images. The scheme is more secure because of many parameters used in the construction of SPM. The original images are recovered by using the correct parameters of FWT and SPM. Phase mask SPM based on DVTL increases security that enlarges the key space for encryption and decryption. The proposed encryption scheme is a lens-less optical system and its digital implementation has been performed using MATLAB 7.6.0 (R2008a). The computed value of mean-squared-error between the retrieved and the input images shows the efficacy of scheme. The sensitivity to encryption parameters, robustness against occlusion, entropy and multiplicative Gaussian noise attacks have been analysed.

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Acknowledgement

The author wishes to thank the management of The NorthCap University for their encouragement and inspiration that lent support during the course of this work.

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  1. Department of Applied Sciences, The NorthCap University, Sector 23-A, Gurgaon, 122 017, India

    Hukum Singh

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  1. Hukum Singh
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Singh, H. Cryptosystem for Securing Image Encryption Using Structured Phase Masks in Fresnel Wavelet Transform Domain. 3D Res 7, 34 (2016). https://doi.org/10.1007/s13319-016-0110-y

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  • DOI: https://doi.org/10.1007/s13319-016-0110-y

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