Hybrid encryption and decryption technique using microfabricated diffractive optical elements

Yuan, X.-C.; Tao, Shaohua; Cheong, Wai Chye; Chen, Y. W.; Lim, M. S.; Moh, K. J.; Ho, Anthony T. S.

doi:10.1117/1.1802272

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…When the spectral components of an image filtered by the respective spatial filter are Fourier transformed in the output plane of the second lens, the intensity of the image will be recovered. Note that optical encryption/decryption techniques [11][12][13][14][15][16][17][18][19] can be applied to the DOE. As all the input images are contained in the single DOE, we can encrypt/decrypt the DOE only once instead of multiple times for all the modulated images.…”

Section: The Methodsmentioning

confidence: 99%

Compression and storage of multiple images with modulating blazed gratings

Yin

Tao

2013

J. Opt.

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A method for compressing, storing and reconstructing high-volume data is presented in this paper. Blazed gratings with different orientations and blaze angles are used to superpose many grayscaled images, and customized spatial filters are used to selectively recover the corresponding images from the diffraction spots of the superposed images. The simulation shows that as many as 198 images with a size of 512 pixels × 512 pixels can be stored in a diffractive optical element (DOE) with complex amplitudes of the same size, and the recovered images from the DOE are discernible with high visual quality. Optical encryption/decryption can also be added to the digitized DOE to enhance the security of the stored data.

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Section: The Methodsmentioning

confidence: 99%

Compression and storage of multiple images with modulating blazed gratings

Yin

Tao

2013

J. Opt.

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“…Optical encryption/decryption techniques based on the wavelength, phase, angle, and etc have been extensively used in information encryption and storage [1][2][3][4]. Luisa et al proposed a smart image-packaging optical technique and stored 12 gray images in modulated speckle patterns [5].…”

Section: Introductionmentioning

confidence: 99%

Storage and reconstruction of multiple color images with a phase-only hologram

et al. 2018

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An optical method for storing and recovering multiple color images is presented in this paper. In the storing process, the red, green, and blue components of a color image are separated and respectively quantized. Then the three quantized components are combined as a gray image. Multiple gray images are modulated with corresponding blazed gratings and superposed in a phase-only hologram. In the recovering process, a spatial filter is used to extract all the gray images from the hologram, and the gray scales of the gray images are then converted to the pre-defined colors. The simulation shows that 206 color images can be stored in a phase-only hologram of a size of 512 by 512 pixels and reconstructed from the hologram with high fidelity.

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“…They can be applied to protect items such as bank notes, identity cards, military documents, security passes, and so on. Holograms are encoded/decoded in many ways, such as random phase [1], joint transform correlator (JTC) [2], hybrid [3], and so on [4,5]. The encryption and decryption involve at least two separate holograms that are required to be exactly aligned pixel by pixel in spatial or Fourier domains.…”

Section: Introductionmentioning

confidence: 99%

A Practical Holographic Encryption/Decryption Technique

Tao

2012

Biomedical Optics and 3-D Imaging

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A digital holographic decryption technique is proposed to decode holograms that are printed as gray-scale images. Firstly, holograms are computer-generated and encoded digitally with a conventional holographic encoding method.Phase distributions of the encoded holograms are then converted into gray-scale images, which can be printed on surfaces of various objects. A CCD device is used to capture the printed images, which are then adjusted to match the original holograms. Finally, the adjusted images are converted to phase distributions and decoded digitally. The technique has high security and can be conveniently applied for protecting confidential information.

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Hybrid encryption and decryption technique using microfabricated diffractive optical elements

Cited by 3 publications

References 8 publications

Compression and storage of multiple images with modulating blazed gratings

Compression and storage of multiple images with modulating blazed gratings

Storage and reconstruction of multiple color images with a phase-only hologram

A Practical Holographic Encryption/Decryption Technique

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