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A plaintext-based image encryption method
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A technology of plaintext images and encryption methods, applied in image communication, electrical components, etc., can solve the problems of inability to resist selected plaintext attacks, inability to effectively resist attacks, and insecure encryption algorithms, achieving good encryption effects and improving key sensitivity. , the effect of improving encryption security
Active Publication Date: 2020-02-14
XIDIAN UNIV
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Problems solved by technology
After research by scholars, it is found that most of the first type of encryption algorithms are insecure, because these encryption algorithms either only have one round of scrambling diffusion, or the key space is small, or have nothing to do with the plaintext, etc., which makes them unable to effectively resist attacks.
Although the second type of encryption algorithm is based on plaintext, due to the invariance of the sum of pixel values, the key space of many pseudo-random number generators is small, which makes them unable to resist chosen plaintext attacks, etc.
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Embodiment 1
[0050] See figure 1 , figure 1 A schematic flow diagram of a plaintext-based image encryption method provided by an embodiment of the present invention, the encryption method specifically includes the following steps:
[0051] Construct a three-dimensional cat mapping key according to the plaintext image data and the initial value of the logical mapping;
[0052] Wherein, constructing the three-dimensional cat mapping key includes:
[0053] Execute the XOR operation on the last column of pixel values of the plaintext image data and the first N-1 column pixel values in turn to obtain a column of XOR values, marked as where l n Indicates a pixel value, and N is the number of columns of the plaintext image data;
[0054] The last row of pixel values of the plaintext image data is sequentially XORed with the first M-1 rows of pixel values to obtain a row of XOR values, marked as where h m Indicates a pixel value, and M is the number of lines of the plaintext image da...
Embodiment 2
[0094] In this embodiment, on the basis of the foregoing embodiments, a detailed description of a plaintext-based image encryption method of the present invention will be focused on. Specifically, see figure 2 , figure 2 A detailed flowchart of a plaintext-based image encryption method provided by an embodiment of the present invention, the method may include:
[0095] S1. Generate a pseudo-random number sequence.
[0096] S11. Input a plaintext image with a size of M×N and the initial value q of logistic 0 , according to the key construction method to generate a three-dimensional cat mapping key (x 0 ,y 0 ,z 0 );
[0097] S11a. Take the pixel value of the last column and the pixel value of the last row of the plaintext respectively, and the plaintext has M rows and N columns;
[0098] S11b. Carry out an XOR operation with the last column (row) and the first N-1 columns (first M-1 rows) in turn to obtain a column (row) XOR value, which is marked as where l n (h m)...
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Abstract
The invention relates to an image encryption method based on plaintext. The method comprises the steps of building a three-dimensional cat mapping key according to plaintext image data and a logic mapping initial value; acquiring a three-dimensional cat mapping pseudo-random number sequence according to the three-dimensional cat mapping key, and acquiring a logic mapping pseudo-random number sequence according to the logic mapping initial value; scrambling the plaintext image data according to the three-dimensional cat mapping pseudo-random number sequence, to acquire scrambled image data; anddiffusing the scrambled image data to acquire ciphertext image data. According to the method provided by the embodiment of the invention, the key flow is constructed based on the plaintext, so that an attacker generates the different key flows when the different plaintexts are selected at each time when the plaintexts are in use, and the plaintext attack is basically resisted.
Description
technical field [0001] The invention belongs to the technical field of digital imageprocessing, and in particular relates to a plaintext-based image encryption method. Background technique [0002] Digital image, also known as digital image or digital image, is the representation of two-dimensional image with finite number of numerical pixels. Represented by an array or matrix, its light position and intensity are both discrete. A digital image is an image obtained by digitizing an analog image, with pixels as the basic element, and can be stored and processed by a digital computer or digital circuit. Image encryption is an important issue in the field of information security, so both image information transmission and image encryption technology have attracted widespread attention. For the security requirements of digital image information, four aspects are mainly considered at present, namely: confidentiality, integrity, authentication and non-repudiation. Because chao...
Claims
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