Securing complex and multi-plane data in a lens-less digital holographic information system that uses position-phase-shifting geometry |
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Authors: | Anith Nelleri Joby Joseph |
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Institution: | Photonics Group, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110 016, India |
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Abstract: | A digital holographic information system can process complex three-dimensional (3-D) object information. We demonstrate a scheme for securing complex and 3-D information in the context of in-line digital holography. Double random phase encoding in the free-space propagation domain of light is used to secure the complex information. Encrypted in-line digital holograms are recorded using the position-phase-shifting method. The encrypted complex image at the CCD recording plane is retrieved from the real-valued digital holograms, and is used for decryption. The robustness of the method has also been studied for various securing keys used in the method against blind decryption. A layer-by-layer information retrieval from the encrypted digital hologram is also discussed. The method can also be used to secure digital complex information in a virtual optics modality using holographic principles. |
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Keywords: | In-line digital holography Information security 3-D information processing |
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