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Hyperbolic equation image encryption method

An encryption method and equation technology, applied in the field of image processing, can solve the problem of losing heat distribution information, etc., and achieve the effect of improving stability and security, improving security, and good stability

Inactive Publication Date: 2012-07-11
ZHEJIANG UNIV
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Problems solved by technology

The partial differential equation cryptography system is an innovative solution for image encryption. The existing heat equation has a strong ability to resist attacks in the field of cryptography, but because the heat will lose the heat distribution information step by step in the process of conduction, the heat In order to achieve the time reversibility of the equation to decrypt the process, it is necessary to add non-homogeneous terms to make a quasi-parabolic equation

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  • Hyperbolic equation image encryption method
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  • Hyperbolic equation image encryption method

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Embodiment Construction

[0037] The hyperbolic equation image encryption method will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0038] figure 1 A complete hyperbolic equation image encryption process is shown, and the specific process is as follows:

[0039] 1. Preprocess the image, convert the image into a 256-color grayscale image, and use the image pixel value matrix as plaintext;

[0040] 2. Select a certain initial speed, encryption time and external force as the hyperbolic key (the secret parameter used for the encryption and decryption algorithm);

[0041] 3. The solution of the hyperbolic equation at the time of encryption is used as the ciphertext obtained by the plaintext through the encryption algorithm;

[0042] 4. Through the shared key, the inverse problem solution of process 3 is used as the plaintext obtained by decrypting the ciphertext.

[0043] In the process 1 of the above hyperbolic equation encryption process...

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Abstract

The invention relates to an image processing technology and aims to provide a hyperbolic equation image encryption method which comprises the following steps: preprocessing an image to be used as a plaintext; selecting a hyperbolic equation image encryption key; and encrypting the plaintext according to the encryption key and the hyperbolic equation to obtain a ciphertext. The hyperbolic equation has good time inversion, and the initial speed can be used as the key, thus the image encryption stability and security is improved. Compared with the existing heat equation in the cryptography application, the wave equation has better time inversion, high speed of encryption and decryption carried out through Fourier transform is high and good stability. Compared with the heat equation, the hyperbolic equation has the initial velocity which can be used as the key in the initial value problem so that the security is improved.

Description

technical field [0001] The present invention relates to image processing technology, more specifically, to image encryption and decryption methods. Background technique [0002] In the information age where large-scale data processing methods are constantly being applied, security issues in the process of information transmission have become increasingly prominent. Traditional security solutions are mostly based on fields such as discrete mathematics and number theory. The encryption of images or videos has its own characteristics and requirements. The traditional symmetric encryption algorithm is generally not suitable for image encryption with large data volume and high redundancy due to its low speed in real-time processing. The partial differential equation cryptography system is an innovative solution for image encryption. The existing heat equation has a strong ability to resist attacks in the field of cryptography, but because the heat will lose the heat distributio...

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Application Information

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IPC IPC(8): H04L9/08
Inventor 孔德兴楼琼
Owner ZHEJIANG UNIV
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