Image encryption method based on LFSR state sequence

An encryption method and state sequence technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as short-cycle limitation of system application, to overcome the problem of limited precision, ensure security, and overcome the small key space. Effect

Pending Publication Date: 2019-05-21
深圳竹云科技股份有限公司
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Problems solved by technology

[0002] In recent years, image encryption has become a research hotspot, but...

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  • Image encryption method based on LFSR state sequence

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Embodiment Construction

[0011] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0012] like figure 1 As shown, the steps of the image encryption method based on the LFSR state sequence are: 1) image scrambling; 2) image diffusion; 3) system space analysis: analyze the system space in which the image is stored to determine whether the image is scrambled before or after scrambling. Can the information of the original image be obtained directly; 4) Generate the 128b sequence of the LFSR: what the LFSR selects is a 128-level shift register, and the generator polynomial of the shift register is a 128-level primitive polynomial, without loss of generality, the primitive polynomial ...

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Abstract

The invention relates to an image encryption method based on an LFSR state sequence. The method comprises the steps of image scrambling; Image diffusion; performing system space analysis; generating a128b sequence of the LFSR; performing image encryption analysis; obtaining results. According to the invention, the problems of small key space and limited precision of an encryption system in the prior art are overcome. The 128b sequence of the LFSR ensures the security of the encryption system. And the encryption effect of one-time encryption ensures the security of the plaintext image.

Description

technical field [0001] The present invention relates to an image encryption method, in particular to an image encryption method based on LFSR state sequences. Background technique [0002] In recent years, image encryption has become a research hotspot, but the short period of the underlying sequence limits the application of the system. Generally, there are two processes in image encryption. One is scrambling, which scrambles the image pixels to be encrypted and eliminates the correlation between image pixels. The common method is to use linear transformation. [0003] Due to the impact of calculation accuracy, if a large number of plaintext images need to be encrypted, grouping the plaintext images can ensure that the key stream used is within one cycle, and can ensure that a different key stream is used for each encryption. [0004] For each given initial state, LFSR can generate a pseudo-random sequence. When the initial state is fixed, if the state transition matrix i...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/60
Inventor 陶雯过慧
Owner 深圳竹云科技股份有限公司
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