Image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation

An encryption method and fractional-order technology, applied in the field of digital image processing and information security, can solve problems such as malicious destruction

Active Publication Date: 2017-10-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in a huge digital network, it is inevitable to involve the transmission and storage of images. These images that exist in digital form on the network can be quickly copied, modified, deleted, and added, which can easily lead to some malicious damage. Therefore, The demand for safe and reliable information security technology is becoming more and more urgent

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  • Image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation
  • Image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation
  • Image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation

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Embodiment Construction

[0055] The technical solutions in the embodiments of the present invention will be described clearly and in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0056] The technical scheme that the present invention solves the problems of the technologies described above is:

[0057] A kind of image encryption method based on multi-parameter fractional order discrete Tchebichef transform, it comprises the following steps:

[0058] Step 1: When the initial value and system parameters are determined, generate two random sequences X and Y respectively, and convert the random number sequence into a generated sequence q x and q y ;

[0059] The second step: block the encrypted image with a size of N×M, the block size is n×m, and then perform a one-dimensional multi-parameter fractional discrete Tchebichef transformation on each image block by row and ...

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Abstract

The invention discloses an image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation, and relates to the technical field of digital image processing and information safety. The method comprises the steps: employing the transformation order number of fractional orders of an image block, the initial value of a generation sequence and system parameters as the secret key of image encryption, and then carrying out the encryption of an image. The image decryption process is an inverse process of the above process, and comprises the steps: decrypting the encrypted image through a right secret key and a wrong secret key, and respectively obtaining a right decrypted image and a wrong decrypted image. Experiment analysis indicates that the method provided by the invention is very high in safety. The method increases the secret key space, and improves the safety of an encryption system. In addition, a ciphertext image obtained through the method provided by the invention is a real-value image, and the size of the ciphertext image is the same as the size of an original image, thereby facilitating the displaying, transmission and storage.

Description

technical field [0001] The invention relates to technologies such as signal conversion, chaotic random sequence generation, image encryption, etc., and belongs to the technical fields of digital image processing, information security, etc. Background technique [0002] Images are commonly used information carriers in human society. Because of its intuition and vividness, images have become a form of expression that humans are most willing to accept and use. According to statistics, about 75% of the information a person acquires comes from vision. Therefore, the application field of image processing must involve all aspects of human work and life, such as: aerospace and aviation technology, biomedical engineering, communication engineering, industrial engineering, military public security, culture and art, robot vision, video and multimedia systems, scientific visualization and E-commerce plays a huge role in human life. However, in a huge digital network, it is inevitable...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 肖斌周乐史文明欧阳卫华李伟生
Owner CHONGQING UNIV OF POSTS & TELECOMM
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