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Image encryption method based on two-dimensional compressed sensing and non-linear fraction Mellin transform

A technology of Merlin transformation and two-dimensional compression, which is applied in the field of information security, can solve the problems of reducing measurement time and sampling rate, and achieve the effects of enhancing security, resisting clipping and noise interference, and high key sensitivity

Inactive Publication Date: 2015-04-29
NANCHANG UNIV
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Problems solved by technology

The application of compressed sensing greatly reduces the measurement time and reduces the sampling rate

Method used

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  • Image encryption method based on two-dimensional compressed sensing and non-linear fraction Mellin transform
  • Image encryption method based on two-dimensional compressed sensing and non-linear fraction Mellin transform
  • Image encryption method based on two-dimensional compressed sensing and non-linear fraction Mellin transform

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the embodiments and drawings, but the protection scope of the present invention should not be limited thereby.

[0041] This implementation scheme is divided into two steps: the first step is based on the chaotic system to control the generation of the measurement matrix to realize the measurement encryption to obtain the measured value; the second step is to perform fractional Merlin transformation on the measured value according to the ring range to obtain the ciphertext. The specific steps of this embodiment are as follows:

[0042] Step 1: Take an initial value of x 01 The Logistic chaotic map of , generates a chaotic sequence with a length of 2N, discards the first N values, and obtains the sequence S=[s 1 ,s 2 ,...,s N], and use this sequence as an index sequence to sort the natural sequence n=[1,2,...,N], assuming that the sorted natural sequence is l=[l 1 , l 2 ,...,l N ], select the...

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Abstract

Disclosed is an image encryption method based on two-dimensional compressed sensing and non-linear fraction Mellin transform. Part of Hadamand matrix built through a chaotic system serves as a measurement matrix, projection measurement is carried out on an original image subjected to two-dimensional discrete cosine transform in two orthogonal directions to obtain a measurement value, compression encryption of the image is realized, and the defect of a too large data amount after fraction Mellin transform is carried out on the image is overcome; non-linear fraction Mellin transform is carried out on the measurement value according to an annular range to obtain a ciphertext, and the problem that a linear compressed sensing encryption system is low in safety is resolved. The initial value of the chaotic system and the transform order of fraction Mellin transform serve as the main secret key, and the central coordinates of coordinate transform and inner radius and outer radius of the transform implementation area serve as a secondary secret key. The two-dimensional compressed sensing technology and non-linear fraction Mellin transform are effectively combined, the consumption amount of the secret keys is small, the secret key space is large, and high safety is realized.

Description

technical field [0001] The patent of the present invention belongs to the field of information security technology, and particularly relates to image encryption and image compression technology. Background technique [0002] Image has the characteristics of intuitive image, vivid and concrete, and is one of the important means of expressing information. When storing and transmitting important images, it is necessary to use safe and efficient image encryption technology to protect them. Image encryption technology is to make the original image into information similar to the random noise of the channel through certain operations. This information is unrecognizable to network eavesdroppers with unknown keys (unless it is effectively deciphered), thus effectively protecting the transmission. Image information in . Existing image encryption techniques mainly include image encryption techniques based on pixel permutation, image encryption techniques based on secret segmentation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 龚黎华李昊霖潘书敏周南润
Owner NANCHANG UNIV
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