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Bit-level image encryption method based on compressed sensing and coupling image lattice optimization

A technology of compressed sensing and coupled image, which is applied to encryption devices with shift registers/memory, usage of multiple keys/algorithms, secure communication through chaotic signals, etc., can solve the problems of low efficiency and achieve high efficiency and chaotic The effect of good performance and simplified operation steps

Active Publication Date: 2020-01-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Most of the existing bit-level image encryption methods decompose the image element values ​​into multiple grayscale images for operation, and the efficiency is low

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  • Bit-level image encryption method based on compressed sensing and coupling image lattice optimization
  • Bit-level image encryption method based on compressed sensing and coupling image lattice optimization
  • Bit-level image encryption method based on compressed sensing and coupling image lattice optimization

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Embodiment Construction

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040]Based on CS and OCML, the present invention designs a high and low two-level hierarchical bit-level encryption scheme, referring to figure 1 , the image encryption method includes the following steps:

[0041] Step 1. Substituting the Logistic map optimized for the range of parameter values ​​into the two-way coupled map lattice model to obtain a new multidimensional chaotic system, which is called the Optimized Coupled Map Lattice (OCML) system here.

[0042] The Logistic mapping iterative equation optimized for the value range of the parameter value is:

[0043] x n+1 =sin((f+500)·π·x n ·(1-x n ))·cos((f+500)·π·x n ·(1-x n ))·2

[0044] Among them, f, x n and x n+1 respectively represent the nth element value and the n+1th element value of the iter...

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Abstract

The invention discloses a bit-level image encryption method based on compressed sensing and coupling image lattice optimization. The method comprises the following steps: substituting Logistic mappingwith an optimized parameter value range into a bidirectional coupling image lattice model, and constructing an OCML system; then, generating a required encryption sequence by using OCML according tothe key information; secondly, constructing a high-level measurement matrix and a low-level measurement matrix by utilizing the generated encryption sequence to respectively measure main information and secondary information of the image; quantizing the two levels of measurement values to prevent the data space occupied by the ciphertext image from being larger than the space occupied by the plaintext image information; and finally, scrambling and replacing the quantized image information, and combining the image information into a final ciphertext image according to the weight. The OCML system serves as a chaotic signal generator, CS serves as a tool for compressing and encrypting image information, encryption operation is conducted on the image information on the bit level, and a new image encryption method is achieved. The method is simple and easy to implement and has excellent safety performance.

Description

technical field [0001] The invention relates to the field of image encryption, in particular to a bit-level image encryption method. Background technique [0002] In the application of image encryption, in order to improve the operation efficiency of the encryption process, the image data is usually compressed and encrypted in the transform domain. Compressive sensing (Compressive Sensing, CS) technology ensures that the image compression operation is completed at the same time as the image data is collected, which is conducive to improving the efficiency of the encryption process. In CS-based image encryption methods, a pseudo-random sequence generator is usually used to construct a measurement matrix. Because the variable sequence generated by the chaotic system has the characteristics of deterministic randomness, extreme sensitivity to the initial state and boundedness, it is very suitable as a sequence generator. However, most of the current chaotic systems have proble...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/14H04L9/06H04L9/00
CPCH04L9/001H04L9/0631H04L9/14
Inventor 沈骞刘文波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS