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Multi-image parallel encryption method for non-cascade optical scanning holography

A technology of optical scanning and encryption methods, applied in computer security devices, instruments, computing, etc., can solve the problem that the advantages of recording multi-layer images have not been brought into play, and achieve the effects of practical methods, improved confidentiality performance, and large key space

Active Publication Date: 2021-10-08
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the function of multi-image encryption can be realized in this way, the advantages of OSH in recording multi-layer images have not been brought into play

Method used

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  • Multi-image parallel encryption method for non-cascade optical scanning holography
  • Multi-image parallel encryption method for non-cascade optical scanning holography
  • Multi-image parallel encryption method for non-cascade optical scanning holography

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings, and a specific embodiment of the present invention will be described.

[0048] In this embodiment, a laser light source is used, and it is ensured that the two incident lights have a certain frequency difference. The light wavelength is λ=632.8nm, the pupil size is D=4cm×4cm, and the focal length of the lens is f=2cm. image 3 In the shown four-layer object model to be encrypted, the physical size of the image is 1cm×1cm, and has a size of 64×64 pixels, and z 1 Layer image section and pupil p 1 The distance is 20.20cm, and the longitudinal interval between adjacent images is 0.20cm. The sparsity is set to 2% and the sampling rate is 25%.

[0049] The entire encryption and decryption process can be implemented as follows:

[0050] (1) Generate encryption key and decryption key

[0051] According to the size of the image, the number of images, and the sampling rate, t...

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Abstract

The invention discloses a multi-image parallel encryption method for non-cascade optical scanning holography, and belongs to the field of optical encryption. A plurality of plaintext images with different depths can be encrypted at the same time, and each image can be independently and privately decrypted. According to the invention, a series of different structure patterns are dynamically switched at the pupil to replace a mechanical scanning process. The structure patterns are created by using a modulation measurement matrix, the modulation measurement matrix is obtained by matrix multiplication of an orthogonal modulation matrix and a sensing matrix, and different images correspond to different substructure patterns. Due to the fact that the plaintext image can be distinguished before sampling by means of the quadrature modulation characteristic, the image to be encrypted does not need to be preprocessed, and defocus noise suppression does not need to be conducted on the decrypted image. In addition, the use of the modulation measurement matrix expands the key space. Due to the characteristics, the safety and the practicability of the holographic multi-image encryption system based on optical scanning are greatly improved.

Description

technical field [0001] The invention belongs to the field of optical encryption, in particular to a non-cascade optical scanning holographic multi-image parallel encryption method. Background technique [0002] Since Optical Scanning Holography (OSH) was first applied to secure information transmission in 2003, it has become one of the most promising optical image encryption technologies. Its feature of recording three-dimensional (3D) objects through a single two-dimensional (2D) scan makes OSH-based multi-image encryption possible. However, most OSH methods are usually used for single image encryption or as some stage of a cascaded cryptosystem. The main reason for this situation is that the out-of-focus layer or non-selected layer image will be restored together with the focused layer or selected layer image, which will not only cause crosstalk, but also pose a threat to information security. [0003] So far, two approaches can be considered to solve this problem and ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G06F21/60
CPCG03H1/0011G06F21/602
Inventor 张罗致王琼华周昕余展王迪
Owner BEIHANG UNIV
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