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Multi-image encryption and decryption method and computer-readable storage medium

An encryption method and multi-image technology, applied in the field of information security, can solve the problems affecting the quality of decrypted images, interference, etc., and achieve the effect of high security and robustness

Active Publication Date: 2019-12-17
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be interference problems in information multiplexing, which affects the quality of decrypted images

Method used

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  • Multi-image encryption and decryption method and computer-readable storage medium
  • Multi-image encryption and decryption method and computer-readable storage medium
  • Multi-image encryption and decryption method and computer-readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Please refer to Figure 1-2 , Embodiment 1 of the present invention is: a kind of multi-image encryption method, comprises the following steps:

[0101] S101: Perform scrambling on multiple images to be encrypted respectively; further, perform Arnold transform scrambling on multiple images to be encrypted respectively.

[0102] The Arnold transform achieves the encryption effect by changing the position of each pixel in the image. The algorithm is simple and periodic, and it is a widely used information hiding technology. Specifically, assuming that (x, y) represents the position of the pixel before transformation, and (x', y') represents the position of the pixel after transformation, for a digital image of N×N size, the mapping relationship between the positions is as in the first As shown in the formula, where Mod represents the remainder operation.

[0103] First formula:

[0104] S102: Place the multiple scrambled images to be encrypted respectively on cross-s...

Embodiment 2

[0127] Please refer to Figure 4-5 , this embodiment is a multi-image decryption method corresponding to Embodiment 1, comprising the following steps:

[0128] S201: Perform Fourier transform on the real-valued coded encrypted image to obtain a complex object light wave; that is, extract the complex-valued signal ψ(x, y) after performing Fourier transform on the real-valued signal.

[0129] S202: According to the second light wavelength and the distance from the second observation plane to the first observation plane, perform Fresnel inverse diffraction calculation on the object light wave to obtain Fresnel inverse diffraction light wave;

[0130] S203: According to the second random phase template, the first light wavelength corresponding to each section, and the distance from each section to the first observation plane, perform Fresnel inverse diffraction calculation on the Fresnel inverse diffraction light wave to obtain the Fresnel inverse diffracted light wave; specifica...

Embodiment 3

[0150] This embodiment is a further extension of the foregoing embodiments.

[0151] In order to measure the quality of the enlarged image, evaluation indicators such as mean square error, brightness error, spectral flatness, and structural similarity are used, and the row and column directions are each enlarged by K times, and the enlarged image is divided into K×K sizes. A pixel of corresponds to a K×K size image block in the enlarged image. Suppose the original image is X(m,n) and the size is M pixel ×N pixe , the enlarged image is Y(m',n'), 1≤m'≤KM-1, 1≤n'≤KN-1, defined

[0152]

[0153] normalized mean square error

[0154] Normalized Luminance Error

[0155] Spectrum flatness

[0156] Among them, F(m,n) represents the image spectrum.

[0157] In order to measure the similarity between two signals, a correlation coefficient and a structure similarity function are introduced; for two signals f1 and f2, define

[0158] normalized cross-correlation coefficien...

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Abstract

The invention discloses a multi-image encryption method, a multi-image decryption method and a computer readable storage medium. The multi-image encryption method comprises the steps of placing multiple scrambled to-be-encrypted images on cross sections at different depths of a virtual three-dimensional object; carrying out Fresnel diffraction calculation on object light waves of each cross section to obtain Fresnel diffraction light waves of each cross section on a first observation plane; calculating to obtain object light waves of the first observation plane; carrying out Fresnel diffraction calculation on the object light waves of the first observation plane to obtain the object light waves of a second observation plane; and carrying out inverse Fourier transform on the object light waves of the second observation plane after the object light waves are subjected to conjugate symmetrical arrangement so as to obtain a real-value encrypted image. The decryption method comprises the decryption steps opposite to the encryption steps, and a decrypted image is reconstructed on a reconstruction image surface in non-interfering, non-interpolation and controllable manners. The multi-image encryption method can realize multi-image encryption and has relatively high safety and robustness; and the reconstructed image of the decrypted image is relatively high in quality, and has a good edge preserving characteristic.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a multi-image encryption and decryption method and a computer-readable storage medium. Background technique [0002] Image is a physical form of visual information expression. With the increasing popularity of mobile phones, tablet computers, digital cameras, video cameras and other portable devices in modern society and the development of Internet technology, the acquisition and transmission of digital images has become more convenient. But this also brings about the security of the image. In order to protect the image content, the image encryption technology used to convert plaintext into ciphertext is an important way to protect the implementation. The related information security theory and Methods have also been developed rapidly, and innovative theories and methods are constantly emerging. Among many image encryption methods, encryption technology based on inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/88H04N19/85H04N19/44G06T9/00
CPCG06T9/00H04N19/44H04N19/85H04N19/88
Inventor 陈家祯郑子华叶锋连桂仁吴为民许力
Owner FUJIAN NORMAL UNIV
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