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Method for realizing image encryption by adopting nonlinear low-pass filtering

A low-pass filtering and non-linear technology, applied in the field of image encryption using non-linear low-pass filtering, can solve problems such as difficult expansion, low-pass transformation distortion, etc.

Active Publication Date: 2020-12-01
NAVAL AVIATION UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for implementing image encryption using nonlinear low-pass filtering, and then to a certain extent overcome the problems of difficult expansion and low-pass transformation distortion existing in traditional image encryption and decryption algorithms

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  • Method for realizing image encryption by adopting nonlinear low-pass filtering
  • Method for realizing image encryption by adopting nonlinear low-pass filtering
  • Method for realizing image encryption by adopting nonlinear low-pass filtering

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Embodiment Construction

[0067] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solutions have not been shown or descr...

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Abstract

The invention provides a method for realizing image encryption by adopting nonlinear low-pass filtering. The method is suitable for image data encryption and decryption transmission. The method mainlycomprises the steps of: after normalization preprocessing is carried out on image data, performing extensible first-time low-pass filtering transformation, and serving transformation parameters as afirst secret key; and performing secondary low-pass filtering transformation, taking the transformation parameter as a second secret key, performing nonlinear symmetric transformation to complete image encryption, taking the transformation parameter as a third secret key to inform a receiver, and sequentially performing corresponding inverse transformation by the receiver by adopting the three secret keys to complete decryption of the image data. The method has the advantages that both low-pass filtering transformation and nonlinear symmetric transformation are very easy to expand, multiple encryption is realized, and the security of the file is improved. Meanwhile, the distortion degree in the decryption process is small, the decryption mode is basically similar to the encryption mode, only parameters are different, and engineering application is very convenient.

Description

technical field [0001] The invention relates to the field of image encryption and restoration, in particular to a method for implementing image encryption by using nonlinear low-pass filtering. Background technique [0002] With the development of society and network, more and more images are spread on the Internet. In some important financial and military fields, the security of image transmission has attracted more and more researchers' attention. Image encryption and decryption technology has developed rapidly in recent decades. Low-pass filters are generally used in digital signal processing for filtering signals with noise. But it can also be applied to the encryption and decryption of image signals. At present, there are not many studies on the application of low-pass filtering to encryption and decryption. The main reason is that encryption is easy to decrypt but difficult to decrypt. Due to the inevitable differential operation in the decryption process, it is ve...

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Application Information

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IPC IPC(8): H04N1/32H04N1/44
CPCH04N1/32272H04N1/4486
Inventor 雷军委李辉梁勇王玲玲闫实
Owner NAVAL AVIATION UNIV
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