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Single channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding

A technology of discrete wavelet transform and chaotic random phase, which is applied in the field of information security and optical information processing, can solve the problems of reducing the system key space, not being able to make keys, phase plate key management and transmission inconvenience, and achieve management and transmission Convenience, resistance to cryptographic attacks, and the effect of ensuring security

Inactive Publication Date: 2018-03-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most image encryption systems based on double random phase encoding methods have the following disadvantages and deficiencies: (1) When the image to be encrypted is a real-valued image, the first random phase plate located at the input plane cannot be used as a key, The key space of such systems is greatly reduced; (2) the management and transmission of phase plate keys are inconvenient; (3) most of these encryption systems are designed for grayscale or binary images, and cannot be directly used for encryption color image

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  • Single channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding
  • Single channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding
  • Single channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding

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Embodiment 1

[0069] A single-channel color image encryption method based on discrete wavelet transform and chaotic double-random phase encoding, the schematic diagram of its encryption and decryption principle is as follows figure 1 shown. The method consists of an encrypted part of the image and a decrypted part.

[0070] (1) The encrypted part of the image:

[0071] In the encryption process, the color image to be encrypted is firstly decomposed into three color channels of R, G, and B; then, a gray-scale carrier image is decomposed into four frequency bands by using discrete wavelet transform, and three of the high-frequency The frequency bands are replaced by the three color channels of the color image; next, Fresnel transform is performed on the carrier image containing the color image information, the transformed image is modulated by the first chaotic random phase plate, and then the modulated image is subjected to the second One Gyrator transformation; finally, the Gyrator transf...

Embodiment 2

[0076] Combine below figure 1 The design principle introduces the scheme in embodiment 1 in detail, see the following description for details:

[0077] A single-channel color image encryption method based on discrete wavelet transform and chaotic double-random phase encoding, the schematic diagram of its encryption and decryption principle is as follows figure 1 shown. The method consists of an encrypted part of the image and a decrypted part. The specific implementation manners of these two parts will be described in detail below.

[0078] (1) The encrypted part of the image:

[0079] 1) First decompose the color image f to be encrypted into three RGB color channels f R , f G and f B ; Then use the discrete wavelet transform to transform the carrier image f Z Broken down into four frequency bands:

[0080] [LL 1 ,LH 1 ,HL 1 ,HH 1 ]=DWT(f Z ) (1)

[0081] In the formula, LL 1 ,LH 1 ,HL 1 ,HH 1 Respectively, the low-low, low-high, high-low, high-high frequency...

Embodiment 3

[0102] Below in conjunction with specific accompanying drawing, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0103] Adopt the image encryption method provided by the implementation of the present invention to convert a color image (such as figure 2 Shown in (a)) Embedding a carrier image (such as figure 2 As shown in (b), the carrier image is encrypted into a noise-like image (such as figure 2 (c) shown). Depend on figure 2 (c) It can be seen that both the information of the color image and the carrier image are hidden in the noise-like image, which shows that the encryption of the color image by this system is successful.

[0104] The image encryption method provided by the implementation of the present invention is used to restore the original color image from the encrypted image. When all keys are correct, the result obtained is as follows: figure 2 (d) shown. Depend on figure 2 (d) It can...

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Abstract

The invention relates to the technical field of information security and optical information processing. In order to realize single channel encryption of a color image, greatly reduce the complexity of a cryptosystem, greatly increase a key space, improve the security of the system, enable the management and transmission for random phase plate keys become very convenient and effectively resist common cryptology attacks, the technical scheme employed by the invention is a single channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding. The method comprises the following steps that 1), according to an encryption part of the image, a to-be-encrypted color image is decomposed into three color channels: read R, green G and blue B, and then a gray carrier image is decomposed into four bands through discrete wavelet transform; 2), according a decryption part of the image, inverse transformer of secondary Gyrator transform is carried out on an encrypted image and then the encrypted image is modulated by a conjugate plate of a second chaotic random phase plate. The method is mainly applied to an information security occasion.

Description

technical field [0001] The invention relates to the technical fields of information security and optical information processing, in particular to a single-channel color image encryption method based on discrete wavelet transform and chaotic double random phase encoding. Background technique [0002] As one of the most popular multimedia forms at present, digital images are widely used in the fields of politics, economy, military affairs, education and so on. In today's highly developed Internet technology, how to protect digital images from tampering, illegal copying and dissemination has important practical significance. The research on image encryption technology has become one of the hotspots in the field of information security. [0003] Due to the advantages of optical information processing technology, such as high processing speed, high parallelism, and fast implementation of convolution and correlation operations, digital image encryption using optical methods has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/44H04N1/32H04L9/00G06T3/40
Inventor 唐晨苏永钢
Owner TIANJIN UNIV
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