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Image encryption method and device

An encryption method and technology of an encryption device, applied in the direction of an encryption device with a shift register/memory, a secure communication device, a computer security device, etc.

Active Publication Date: 2017-02-15
CHONGQING UNIV OF EDUCATION
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an image encryption method and an image encryption device that combine image scrambling and block coding, and corresponding The keystream generation method and keystream generator for

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  • Image encryption method and device
  • Image encryption method and device

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Embodiment Construction

[0064] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0065] see figure 1 , is a flowchart of an image encryption method according to a preferred embodiment of the present invention. Such as figure 1 Shown, the image encryption method of this embodiment comprises the following steps:

[0066] First, in step S101, a key stream generation step is performed, that is, a first key stream Key1 and ...

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Abstract

The invention relates to an image encryption method, an image encryption device, a key stream generation method and a key stream generator. The image encryption method comprises following steps of constructing a coupling image grid sequence based on the initial value, processing the coupling image grid sequence to be a first key stream by means of symmetric matrix transformation, replacing the first key stream through a password displacement box to obtain a second key stream, scrambling the original image by means of the first key stream, carrying out block encoding to the scrambled image by means of the second key stream, and obtaining the encrypted image data. According to the invention, the scrambling operation encryption method and the block encoding encryption method are combined, the encryption safety is improved, and the computation complexity of the encryption operation is well reduced; different key streams are used in the scrambling operation and the block encoding; compared with a method that a single key stream is used, the image encryption method is advantaged in that the encryption safety is higher.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method, an image encryption device, a key stream generation method and a key stream generator. Background technique [0002] With the continuous development of information technology and the Internet, information security has become the primary issue that should be considered in the process of information transmission. As the main carrier of information transmission, image encryption technology has become one of the research hotspots in the field of information security. [0003] In recent years, people have proposed many methods of image encryption. One of the most widely used image encryption methods is the image encryption method based on pixel scrambling, that is, scrambling the rows and columns of the image. However, two points are generally considered in the image encryption process: first, whether the computational overhead is within an accep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60H04L9/06
CPCG06F21/602H04L9/0618
Inventor 韦鹏程李莉雷列吴莹莹
Owner CHONGQING UNIV OF EDUCATION
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