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Region-of-interest medical image chaotic encryption method based on information entropy update key

A technique of updating keys for areas of interest, applied in chaos model, image enhancement, image analysis, etc., can solve the problems of low encryption efficiency and inability to resist security flaws in medical image encryption technology, and achieve protection and frequency domain encryption Effect

Active Publication Date: 2019-09-03
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Region-of-interest medical image chaotic encryption method based on information entropy update key
  • Region-of-interest medical image chaotic encryption method based on information entropy update key
  • Region-of-interest medical image chaotic encryption method 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, the chaotic encryption method of the medical image of the region of interest based on information entropy update key, this method is realized by the following steps:

[0044] Step 1. Take a gray-scale medical image of "Maximum Chest Density Projection" with a size of 512×512, as shown in the attached image 3 A) Shown 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 the image block B, and s=1, 2,...,65536.

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

[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] w...

specific Embodiment approach 2

[0136] Specific embodiment two, combine figure 2 with image 3 This embodiment is described. This embodiment is the decryption method of the chaotic encryption method for medical images in regions of interest based on information entropy update key described in the first embodiment. The specific process is as follows:

[0137] Step A, taking a grayscale medical ciphertext image EnImg with a size of 512×512 as an 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, and s=1, 2, . . . , 65536.

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

[0140]

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

[0142] Step D, the encryption region discrimination of the encrypted image, the discrimination method is as f...

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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 an area 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 information development. In such an 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 ever-increasing medical needs and the unbalanced development of medical technology, it uses the Internet as a carrier and uses 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 model has also brought about information security ...

Claims

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Application Information

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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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