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Image encryption method based on compressive sensing and index scrambling

A technology of compressed sensing and encryption methods, which is applied in the field of image processing, can solve the problems of excessive secret keys, difficulty in storage and memory, etc., and achieve high sensitivity, reduced secret keys, and small data volume

Inactive Publication Date: 2016-02-03
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

However, this algorithm directly uses the entire measurement matrix as the secret key, which is too large to be stored and memorized

Method used

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  • Image encryption method based on compressive sensing and index scrambling
  • Image encryption method based on compressive sensing and index scrambling
  • Image encryption method based on compressive sensing and index scrambling

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Embodiment Construction

[0029] Embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] refer to figure 1 , the implementation steps of the present invention are as follows:

[0031] Step 1: Expand the original image x under the orthogonal basis Φ to obtain the sparse coefficient α:

[0032] α=Φ*x

[0033] The orthogonal basis used in this example is the discrete cosine transform DCT basis, and the original image x is selected from the standard test image library.

[0034] Step 2: Construct a measurement matrix G of size M*N.

[0035] The existing encryption methods usually use the existing Gaussian matrix as the measurement matrix to construct the measurement matrix G, and then use the entire measurement matrix as the key, which will lead to the problem that the amount of the key is too large. To solve this problem, the method of the present invention produces a construction sequence with the Logistic chaot...

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Abstract

The invention discloses an image encryption method based on compressive sensing and index scrambling, which is mainly used for solving the problems of overlarge secret key amount and ciphertext amount and poor physical implementation of an encryption system in the prior art. The image encryption method comprises the following steps: (1) unfolding an original image in an orthogonal basis to obtain a sparse coefficient; (2) controlling to constitute a measurement matrix by using a Logistic sequence; (3) using the measurement matrix to measure the sparse coefficient to obtain a measured value; (4) scrambling the measured value by using the Logistic sequence to obtain a scrambled measured value; and (5) quantifying the scrambled measured value to transmit the same as a ciphertext. The method disclosed by the invention is used for constituting the measurement matrix by using the Logistic sequence to greatly reduce the number of secret keys and improving the enforceability of a hardware system, and the method can be applied to encryption processing of remote images.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to an image encryption method based on compressed sensing and index scrambling, which can be used in the remote image processing process. Background technique [0002] With the development of multimedia technology, the application of images is becoming more and more extensive, and image security has received more and more attention. In some applications that require relatively high image security, such as remote military pictures, remote commercial drawing design, etc., these images have a large amount of data and high requirements for real-time performance. Traditional text encryption algorithms are difficult to meet the requirements, so the image data The research of encryption algorithm has very important significance. [0003] Existing encryption algorithms often combine multiple encryption algorithms to improve the security of the system. Some image encryption algorithms that ...

Claims

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Application Information

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IPC IPC(8): H04N1/32
CPCH04N1/32272
Inventor 宋彬曹茸李莹华郭洁秦浩
Owner XIDIAN UNIV
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