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Algorithm for encrypting image on basis of chaotic mapping and series changing

A technology of chaotic mapping and encryption algorithm, which is applied in image communication, image data processing, image data processing, etc., and can solve problems such as weak anti-statistical analysis

Inactive Publication Date: 2013-02-06
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

In this paper, the pseudo-random characteristics of the chaotic system are mainly used, and the key space is expanded, but it is weak in anti-statistical analysis

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  • Algorithm for encrypting image on basis of chaotic mapping and series changing
  • Algorithm for encrypting image on basis of chaotic mapping and series changing
  • Algorithm for encrypting image on basis of chaotic mapping and series changing

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Embodiment Construction

[0017] figure 1 It is an image encryption algorithm flow chart based on chaotic mapping and sequence transformation; the image encryption algorithm based on chaotic mapping and sequence transformation of the present invention comprises the following steps:

[0018] (1). Use the Logistic chaotic sequence to construct a two-dimensional square matrix with the same size as the gray image to be encrypted. The definition model of the Logistic chaotic sequence is x n+1 =μ 0 *x n *(1-x n ), where, 00 ≤4, 00 n =(x n *1000)mod256 needs to expand each sequence value obtained and then take the modulus of 256, so as to ensure that the obtained random integer sequence is between 0-255, and convert the obtained random sequence into a two-dimensional integer sequence of the same size according to the size of the image .

[0019] (2). The value of each pixel of the original image is bitwise XORed with the matrix after the modulus obtained in (1), and the size of the original image A is m*...

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Abstract

An algorithm for encrypting an image on the basis of chaotic mapping and series changing comprises the following steps that: the pixel value of an image and a two-dimensional matrix which has the same size with the image and is formed by a Logistic chaotic sequence are subjected to binary bitwise XOR processing; the Logistic chaotic sequence is subjected to the mapping transformation so that two two-dimensional matrixes are formed; a row matrix is multiplied by an image matrix and a line matrix in sequence, so that location chaotic operation is finished; and the original image information cannot be visually sensed from the obtained encrypted image and can be completely hidden. By the method, the encrypted imaged can resist the attack from gray value statistic analysis and general interference attack from shear, noise and gauss lowpass filtering.

Description

Technical field: [0001] The invention relates to a digital image encryption algorithm, in particular to an image encryption algorithm based on chaotic mapping and sequence transformation. Background technique: [0002] With the rapid development of science and technology, information technology has been widely used in people's daily life. At the same time, the perfect combination of network technology and multimedia technology has further broadened the application range of the network. medium for exchange. Therefore, network information exchange is particularly important today. Digital images are an important carrier of multimedia information, and the safe transmission of images has become an important direction of information security issues at this stage. The process of encrypting digital image information to make it an indistinguishable secret image has been widely studied in this field in recent years. The encryption method is mainly to transform the position of image p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04N21/2347
Inventor 张健任洪娥陈宇
Owner NORTHEAST FORESTRY UNIVERSITY
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