Abstract
In this study, we propose a novel method to encrypt fully-phase information combining the concepts of the transport of intensity equation and spatially variant polarization encoding. The transport of intensity equation is a non-iterative and non-interferometric phase-retrieval method which recovers the phase information from defocused intensities. Spatially variant polarization encoding employs defocused intensity measurements. The proposed cryptosystem uses a two-step optical experimentation process—primarily, a simple set-up for defocused intensities recording for phase retrieval and then a set-up for encoding. Strong security, convenient intensity-based measurements, and noise-free decryption are the main features of the proposed method. The simulation results have been presented in support of the proposed idea. However, the TIE section of the cryptosystem, as of now, has been experimentally demonstrated for micro-lens.
Highlights
Electronics 2021, 10, 969. https://Information security has become one of the prime concerns in the current digital era, which has led to the development of many encryption–decryption techniques [1,2,3,4,5]
When the light beam illuminates onto a nearly transparent phase object and the intensity distribution of transmitted light can be recorded cording the defocused intensities of the phase object for transport of intensity equation (TIE)-based phase retrieval, while another setup is required for encrypting the information using polarization encoding
It was shown through DRPEbased approaches that the decrypted images from fully-phase encryption are more robust to noise than amplitude-based encryption [30,31]
Summary
Electronics 2021, 10, 969. https://Information security has become one of the prime concerns in the current digital era, which has led to the development of many encryption–decryption techniques [1,2,3,4,5]. Different features of light are utilized for the secure storage and transfer of information. Optical methods provide high-speed processing due to inherent parallelism and various degrees of freedom such as amplitude, phase, polarization, and orbital angular momentum, along with their spatial and temporal variations. For this reason, optical techniques of image encryption and decryption have found widespread interest among researchers [2,3]. Several features of light have been explored to improve the performance and level of security [6,7,8,9,10].
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