Chaotic Encryption Method of Medical Image in Region of Interest Based on Information Entropy Update Key

A technology of region of interest and key update, applied in image enhancement, image analysis, chaotic model and other directions, can solve the problems of irresistible security defects, low encryption efficiency of medical image encryption technology, etc., to achieve protection and achieve frequency domain encryption Effect

Active Publication Date: 2020-12-11
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0004] In order to solve the security defects of low encryption efficiency and inability to resist known plaintext and chosen plaintext attacks in the existing medical image encryption technology, the present invention provides a chaotic encryption and decryption method for medical images in an area of ​​interest based on an information entropy key update method

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  • Chaotic Encryption Method of Medical Image in Region of Interest Based on Information Entropy Update Key
  • Chaotic Encryption Method of Medical Image in Region of Interest Based on Information Entropy Update Key
  • Chaotic Encryption Method of Medical Image in Region of Interest Based on Information Entropy Update Key

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination Figure 1 to Figure 3 Describe this embodiment, a chaotic encryption method for medical images in a region of interest based on information entropy update key, and the method is implemented by the following steps:

[0044] Step 1. Take a grayscale medical image of "maximum density projection of the chest" with a size of 512 × 512, as attached image 3 A), as the original image Pimg.

[0045] Step 2. Divide the original image Pimg into image blocks B with a size of 2×2 s , a total of 65536 image blocks are obtained, where s is the number of image block B, s=1,2,...,65536.

[0046] Step 3: Calculate the image block B described in step 2 in turn according to formula (1) s The average of the grayscale values ​​of all pixels within

[0047]

[0048] where mean2() represents the matrix mean function.

[0049] Step 4: Discrimination of the region of interest, the discrimination method is as follows:

[0050] when , then th...

specific Embodiment approach 2

[0136] Specific embodiment 2. Combination figure 2 and image 3 This embodiment is described. This embodiment is the decryption method of the chaotic encryption method for medical images in the region of interest based on the information entropy update key described in the specific embodiment 1, and the specific process is as follows:

[0137] Step A: Take the grayscale medical ciphertext image EnImg with a size of 512×512 as the encrypted image.

[0138] Step B. Divide the encrypted image EnImg into image blocks B2 with a size of 2×2 s , a total of 65536 image blocks are obtained, where s is the number of the image block B2, s=1,2,...,65536.

[0139] Step C, calculate the image block B2 described in step 2 in turn according to formula (30) s The average value of all pixel gray values ​​within

[0140]

[0141] where mean2() represents the matrix mean function.

[0142] Step D, the encryption area discrimination of the encrypted image, the discrimination method is a...

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Abstract

The invention discloses a region-of-interest medical image chaotic encryption method based on an information entropy update key, and relates to the technical field of image information security, whichcan overcome the security defects that an existing medical image encryption technology is low in encryption efficiency and cannot resist attacks of known plaintexts and selected plaintexts. Accordingto the information entropy updating key-based region-of-interest medical image chaotic encryption and decryption method provided by the invention, the region-of-interest of the medical image is processed by utilizing wavelet transform, so that the frequency domain encryption of the image is realized. Meanwhile, the hyperchaotic system is used for scrambling and diffusing the region of interest ofthe medical image, so that the protection of the image in a spatial domain is realized. Besides, according to the information entropy key updating method designed by the invention, the key is not only related to the parameters of the chaotic system, but also related to the plaintext image, so that known plaintext attacks or selected plaintext attacks can be resisted.

Description

technical field [0001] The invention relates to the technical field of image information security, in particular to a chaotic encryption and decryption method for medical images in a region of interest based on an information entropy key update method. Background technique [0002] With the continuous development of the "Internet +" era, all walks of life have entered the process of informatization development. In this era, in order to meet the different needs of different groups of people in different regions, "Internet + medical care" came into being. In order to solve the contradiction between people's increasing medical needs and the unbalanced development of medical technology, it uses the Internet as a carrier to use increasingly updated technical means to realize various modes of medical services such as telemedicine, online consultation and electronic health records. . At the same time, the operation of this mode also brings information security problems. Facing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/60G06N7/08G06T1/00
CPCG06F21/602G06N7/08G06T1/00G06T2207/20064G06T2207/20104
Inventor 李锦青底晓强
Owner CHANGCHUN UNIV OF SCI & TECH
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