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Color image encryption and hiding method based on pt-lct and dwt-svd

A PT-LCT, color image technology, applied in the field of information security and optical information processing, can solve problems such as chosen plaintext attack and known plaintext attack

Inactive Publication Date: 2020-07-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such linear symmetric cryptosystems are vulnerable to chosen-plaintext attacks and known-plaintext attacks, etc.
[0004] In addition, when the image is transmitted over the network, only encrypting the image (for example, changing a meaningful image into a meaningless noise-like image) is easy to attract the attention of attackers

Method used

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  • Color image encryption and hiding method based on pt-lct and dwt-svd
  • Color image encryption and hiding method based on pt-lct and dwt-svd
  • Color image encryption and hiding method based on pt-lct and dwt-svd

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A color image encryption and hiding method based on PT-LCT and DWT-SVD, the schematic diagram of its encryption and embedding principle is as follows figure 1 (Since the extraction and decryption process is the reverse process of the embedding and encryption process, the schematic diagram of the extraction and decryption principle is omitted here). The method consists of the encryption part of the color image to be hidden, the embedding part of the color encryption image, the extraction part of the color encryption image and the decryption part of the color image.

[0052] (1) The encrypted part of the color image to be hidden:

[0053] In the encryption process, the color image to be hidden is processed in the following steps to achieve the purpose of encrypting the color image. (1) the color image I to be encrypted RGB Decomposed into RGB three color channels I R ,I G ,I B , and perform generalized Arnold scrambling on each color channel; (2) convert the scrambl...

Embodiment 2

[0062] Combine below figure 1 1. The design principle introduces the scheme in embodiment 1 in detail, see the following description for details:

[0063] A color image encryption and hiding method based on PT-LCT and DWT-SVD, the schematic diagram of its encryption and embedding principle is as follows figure 1 shown. The method consists of the encryption part of the color image to be hidden, the embedding part of the color encryption image, the extraction part of the color encryption image and the decryption part of the color image. The specific implementation manners of these four parts will be described in detail below.

[0064] (1) The encrypted part of the color image to be hidden:

[0065] In the encryption process, the color image to be hidden is processed in the following steps to achieve the purpose of encrypting the color image.

[0066] A. The color image I to be encrypted RGB Decomposed into RGB three color channels I R ,I G ,I B , and generalized Arnold...

Embodiment 3

[0141] 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:

[0142] Adopt the image encryption that the present invention provides and concealment method to a color image (as figure 2 As shown in (a), after encryption, the obtained encrypted image is as follows figure 2 (b) shown. Depend on figure 2 (b) It can be seen that any information of the original image is hidden. It shows that the encryption of the image to be hidden by this system is successful.

[0143] Adopt the image encryption that the present invention implements to provide and hiding method will figure 2 The encrypted image shown in (b) is embedded as image 3 In the carrier image shown in (a), get as image 3 Cover image containing the secret image shown in (b). Depend on image 3 (b) and 3(a), it can be seen that the human eye cannot distinguish the difference between the two im...

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Abstract

The invention relates to the information safety and light information processing technology field and provides a color image encryption and hiding method based on PT-LCT and discrete wavelet transform-singular value decomposition (DWT-SVD). Finally, a color carrier image including a secret image is acquired. The color image encryption and hiding method based on PT-LCT and DWT-SVD is characterized by firstly, encrypting a color image to be hidden through Arnold scrambling and a PT-LCT system; then, converting the color carrier image from an RGB color space into a YCbCr space; and then, embedding the encrypted color image into Cb and Cr channels through a DWT-SVD method; and finally, converting the Cb and Cr channels including the secret image and a Y channel into the RGB color space so that the color carrier image including the secret image is acquired. The method is mainly applied to an information safety and light information processing occasion.

Description

technical field [0001] The invention relates to the technical fields of information security and optical information processing, in particular to a color image encryption and hiding method based on PT-LCT and DWT-SVD. 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 and hiding technology has become one of the hot spots 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 aroused great interest in recent years. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00H04N19/635H04N19/60
CPCG06T9/00H04N19/60H04N19/635
Inventor 唐晨苏永钢
Owner TIANJIN UNIV
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