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Two-dimensional CAD (Computer Aided Design) engineering drawing content variable-strength encrypting method and device

An encryption method and engineering drawing technology, applied in computer security devices, instruments, electrical digital data processing, etc., can solve problems such as high time complexity and format damage, and achieve the effect of improving encryption efficiency and facilitating management and maintenance

Inactive Publication Date: 2012-05-16
HUNAN UNIV
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Problems solved by technology

[0009] In view of this, the embodiment of the present invention provides a method capable of variable-intensity encryption of two-dimensional CAD engineering drawing content, w

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  • Two-dimensional CAD (Computer Aided Design) engineering drawing content variable-strength encrypting method and device
  • Two-dimensional CAD (Computer Aided Design) engineering drawing content variable-strength encrypting method and device
  • Two-dimensional CAD (Computer Aided Design) engineering drawing content variable-strength encrypting method and device

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Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions proposed in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] The first step in the embodiment of the present invention is key preprocessing, refer to figure 1 Including the following steps:

[0031] Step 1: Choose DCT block size G, encryption strength F and key Key=k 1 k 2 ...k n ;

[0032] Step 2: Obtain the initial value x of the two-dimensional Logistic mapping (see formula (3)) from formulas (1) and (2) 0 ,y 0 . The control parameter u of the two-dimensional Logistic mapping is obtained from formula (4) 1 , u 2 .

[0033] v alue 1 = ( ...

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Abstract

The invention relates to a two-dimensional CAD (Computer Aided Design) engineering drawing content variable-strength encrypting method and device. The two-dimensional CAD engineering drawing content variable-strength encrypting method comprises the steps of: preprocessing a secret key: selecting an encrypting strength, a DCT (Discrete Cosine Transformation) grouping size and the secret key and preprocessing the secret key; obtaining and processing peak information of a two-dimensional CAD engineering drawing: obtaining all peak information from the two-dimensional CAD engineering drawing, constructing a complex value signal for the peak information of the two-dimensional CAD engineering drawing, carrying out DCT in a grouping manner; encrypting contents of the two-dimensional CAD engineering drawing: correcting the peak information of the two-dimensional CAD engineering drawing by adopting a scrambling and replacing combined manner, and encrypting the contents of the two-dimensional CAD engineering drawing; and decrypting the contents of the two-dimensional CAD engineering drawing: recovering the peak information of the two-dimensional CAD engineering drawing by adopting an inverse process of decrypting the contents of the two-dimensional CAD engineering drawing, and decrypting the contents of the two-dimensional CAD engineering drawing. By using the method or device of the embodiment of the invention, the contents of the two-dimensional CAD engineering drawing CAD be encrypted efficiently with less time and space cost, therefore, the problems of incompatible formats after the contents of the two-dimensional CAD engineering drawing are encrypted by adopting the traditional two-dimensional CAD engineering drawing encrypting method, and lower efficiency are solved.

Description

technical field [0001] The invention belongs to the field of content protection of engineering drawings, in particular to a method and device for encrypting content of two-dimensional CAD engineering drawings with variable intensity. technical background [0002] With the rapid development of information technology and computer network, digitalization has been reflected in the design, control and management of manufacturing industry. Digital manufacturing has greatly reduced the product development cycle and development cost. In digital manufacturing, because two-dimensional CAD engineering drawing directly guides the production and processing of products, it is one of the most widely used information carriers. 2D CAD engineering drawings are the wisdom crystallization of product designers and important assets of enterprises. However, due to the insecurity of the Internet, the possibility of leakage of 2D CAD engineering drawings during the digital manufacturing process is g...

Claims

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Application Information

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IPC IPC(8): G06F21/24G06F21/60
Inventor 彭飞龙敏孙星明
Owner HUNAN UNIV
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