Digital image encryption method with rapid key stream generative mechanism

A digital image and generation mechanism technology, applied in image data processing, image data processing, instruments, etc., can solve the problems affecting the encryption efficiency of chaotic images, high computing load, etc.

Inactive Publication Date: 2013-08-21
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the diffusion module has a high computational load and is

Method used

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  • Digital image encryption method with rapid key stream generative mechanism
  • Digital image encryption method with rapid key stream generative mechanism
  • Digital image encryption method with rapid key stream generative mechanism

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Embodiment Construction

[0053] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0054] In the embodiment of the present invention, such as figure 2 As shown in the middle picture (a), a 256-level grayscale image with a size of 256×256 is encrypted.

[0055] A digital image encryption method with a fast key stream generation mechanism, the flow chart is as follows image 3 shown, including the following steps:

[0056] Step 1: Realize the scrambling processing of the plaintext image based on the generalized discrete Cat mapping, and change the position of each pixel in the image;

[0057] Step 1-1: Implement Cat transformation on the plaintext image, use the generalized discrete Cat mapping defined by formula (1) to scramble the image, and eliminate the correlation between adjacent pixels. The formula is as follows:

[0058] x ′ ...

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Abstract

The invention discloses a digital image encryption method with a rapid key stream generative mechanism, and belongs to the field of image encryption. According to a digital image encryption system with the rapid key stream generative mechanism, a plurality of key stream elements are generated every time chaotic system iteration and key stream element quantification are conducted in a diffusion stage, the number of chaotic system iteration is effectively reduced, so that speed of the encryption system is increased significantly. In addition, the number of the key stream elements which are generated in each time of iteration and quantification is relevant to plaintexts, and capacity of the encryption system for resisting attack from known plaintexts and chosen plaintexts is improved. Cryptology analyses and encryption speed tests indicates that the encryption speed of the digital image encryption system with the rapid key stream generative mechanism is one time higher than the encryption speed in a tradition method on the premise that the encryption system is high in safety.

Description

technical field [0001] The invention belongs to the field of image encryption, in particular to a digital image encryption method with a fast key stream generation mechanism. Background technique [0002] In recent years, with the rapid development of multimedia and computer network technology, digital images, as the most intuitive information carrier, have become an important means for people to exchange information. The dissemination in the sexual network greatly facilitates the access and sharing of information. At the same time, the transmission of image information in many sensitive fields such as business, finance, medical care, scientific research, military affairs, and politics has huge potential security risks, and is often subject to various human attacks, including illegal information Stealing, tampering and publishing, etc., cause huge losses to information owners. [0003] Compared with ordinary text information, digital images have the characteristics of larg...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 付冲温昊祥熊清
Owner NORTHEASTERN UNIV
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