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Image Encryption Method Based on Two-dimensional Compressive Sensing and Nonlinear Fractional Merlin 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 sampling rate and measurement time, and achieves the effects of enhanced security, low key consumption, and resistance to clipping and noise interference

Inactive Publication Date: 2017-11-21
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 Compressive Sensing and Nonlinear Fractional Merlin Transform
  • Image Encryption Method Based on Two-dimensional Compressive Sensing and Nonlinear Fractional Merlin Transform
  • Image Encryption Method Based on Two-dimensional Compressive Sensing and Nonlinear Fractional Merlin Transform

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Embodiment Construction

[0041] 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.

[0042] 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:

[0043] 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 ,···,sN ], 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

An image encryption method based on 2D compressive sensing and nonlinear fractional Merlin transform. Using part of the Hadamand matrix constructed by the chaotic system as the measurement matrix, the original image after the two-dimensional discrete cosine transform is projected from two orthogonal directions to obtain the measured value. This process realizes the compression and encryption of the image to eliminate the image After implementing the fractional Merlin transform, the data volume is too large; then, the measured value is subjected to a nonlinear fractional Merlin transform according to the circular range to obtain the ciphertext, which solves the problem of low security of the linear compressed sensing encryption system. The initial value of the chaotic system and the transformation order of the fractional Merlin transformation are used as the primary key, and the center coordinates of the coordinate transformation and the inner and outer radii of the transformed ring domain are used as the secondary keys. The invention effectively integrates the two-dimensional compressed sensing technology and the nonlinear fractional Merlin transformation, has small key consumption, large key space and high security.

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 Patents(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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