Signature watermark system used for CAD (Computer-Aided Design) documents

A document and watermarking technology, which is applied in image data processing, equipment, program/content distribution protection, etc., can solve the problems of CAD signature system to restore documents, such as difficulty in restoring documents, unable to confirm the issuer, etc., to achieve security protection and ensure integrity Effect

Inactive Publication Date: 2011-07-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing CAD signature system is difficult to restore the

Method used

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  • Signature watermark system used for CAD (Computer-Aided Design) documents
  • Signature watermark system used for CAD (Computer-Aided Design) documents
  • Signature watermark system used for CAD (Computer-Aided Design) documents

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Specific embodiment one: the following combination Figure 1 to Figure 8 This embodiment is described. A signature watermarking system for CAD documents described in this embodiment includes a signature module, a signature verification module and a restoration module.

[0042] The signature module is used to decompose the set chapter shape and embed it into the original CAD document, and embed the signature information watermark and the tampering positioning information watermark for signature, and then publish the signed CAD graphics;

[0043] The seal verification module is used to verify the integrity of the received signed CAD document: extract the signature information of the CAD document to verify whether the signature of the CAD document is forged; restore the watermark graphic of the CAD document, It is used to verify whether the CAD document has been tampered with, and the tampering location information can be given when the graphic is tampered with;

[0044] ...

Example Embodiment

[0049] Specific embodiment two: the following combination figure 1 and figure 2 This embodiment is described. This embodiment further describes Embodiment 1. The workflow of the signature module is as follows:

[0050] Step 1. Determine whether the CAD document has been stamped.

[0051] If the judgment result is yes, exit the program; if the judgment result is no, execute step 2;

[0052] Step 2: Stamping the CAD document to obtain the CAD document containing the stamp;

[0053] Step 3: Embed the signature information watermark of the CAD document on the CAD document containing the chapter;

[0054] Step 4: Embed the tampering information watermark of the CAD document on the CAD document containing the stamp, complete the signature of the CAD document, and publish the CAD graphic after the signature.

[0055] The first is to stamp the CAD document. The main function of this part is to insert the chapter shape into the original graphics, and decompose the chapter block to ...

Example Embodiment

[0058] Embodiment 3: This embodiment further describes Embodiment 2. The process of stamping the CAD document in step 2 is: decompose the set chapter blocks, and then load them into the CAD document.

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Abstract

The invention discloses a signature watermark system used for CAD (Computer-Aided Design) documents, belonging to the field of mechanical drafting. The signature watermark system solves the problems that the existing CAD signature system is hard to restore the documents, and an issuer cannot be determined even the document is protected through the joint hands of encrypting and the system. The signature watermark system comprises a signature module, a check module and a restore module, wherein the signature module is used for decomposing the set shape of a signature for embedding the set shape to the original CAD document, then embedding a signature information watermark and a tamper location information watermark for signature, and finally publishing a CAD graph signed; the check module is used for conducting complete checking on the CAD graph received, extracting the signature information of the CAD document for verifying whether the signature of the CAD document is forged nor not, restoring the watermark graph of the CAD document for verifying whether the CAD document is tampered or not, and giving tamper location information when the graph is tampered; and the restore module is used for restoring the CAD document verified by the check process.

Description

technical field [0001] The invention relates to a signature watermark system for CAD documents, which belongs to the field of mechanical drawing. Background technique [0002] At present, CAD engineering drawing software has gradually replaced manual drawing and has become the first choice for architectural design, parts manufacturing, missile and vehicle design and other departments because of its high graphics accuracy, fast drawing speed, and convenient transmission and storage. However, while it brings convenience to engineers and designers, it also poses serious challenges to the security of electronic drawings and the intellectual property rights they carry. During the dissemination of electronic drawings, people can easily and completely copy and modify the original drawings, which is very likely to cause leakage of confidential information, intellectual property disputes and other issues. [0003] CAD drawings are stored in the form of vector graphics, which cannot ...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/24G06F21/16
Inventor 牛夏牧李琼韩琦石振锋王莘
Owner HARBIN INST OF TECH
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