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A Method of Embedding a Hidden Tracking Watermark in a Word Document

A document and watermark technology, applied in the field of information security, can solve problems affecting normal functions, unable to achieve watermark protection, etc., to avoid hidden watermark modification or deletion, and reduce the probability of detection

Active Publication Date: 2020-07-21
北京司马科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is easy to be recognized by the user, so it can be deleted and affect the normal function;
[0009] 2. Watermark protection problem
The watermark added by this technology depends on the existence of the header and footer. When the user performs the deletion operation of the header and footer, the added watermark will be deleted, and the effect of watermark protection cannot be achieved;
[0010] 3. Security issues

Method used

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  • A Method of Embedding a Hidden Tracking Watermark in a Word Document
  • A Method of Embedding a Hidden Tracking Watermark in a Word Document
  • A Method of Embedding a Hidden Tracking Watermark in a Word Document

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, Embodiment 1 of the present invention provides a method for embedding a hidden tracking watermark in a Word document, which can be provided to the program language interface (such as the operation interface provided to the C# language) by means of Word, or can be based on the file's The format directly modifies its content (such as directly modifying the hexadecimal content), which specifically includes the following steps:

[0046] S1: Add a bookmark in the Word document, add the watermark content to the bookmark, and set it as hidden; the watermark content is a URL string, and the URL string contains a random string of

[0047] S2: replace the bookmark with an InlineShape object, and set the InlineShape object to be invisible; the InlineShape object can be a picture object or an OLE object;

[0048] S3: Convert the InlineShape object into a Shape object, and place the Shape object at a random position in the edge area outside the text.

...

Embodiment 2

[0051] Such as figure 2 As shown, this embodiment 2 provides a method for embedding a hidden tracking watermark in a Word document on the basis of embodiment 1, and this embodiment 2 further defines that the step S2 includes the following steps:

[0052] S2.1: Locating the bookmark and selecting the bookmark;

[0053] S2.2: replace the bookmark with an InlineShape object;

[0054] S2.3: Set the size of the InlineShape object to 0, that is, Width=0 and Height=0.

[0055] Through the above operations, the InlineShape object is made invisible, which avoids affecting the display of the original file page.

[0056] The step S2 may also include the following steps:

[0057] S2.4: Set the TransparentBackground of the InlineShape object to True.

[0058] Through the above operations, set the InlineShape object to be transparent to further make the watermark invisible.

[0059] In the step S3, the method for placing the Shape object at a random position in the outer edge region of ...

Embodiment 3

[0061] Such as image 3 As shown, this embodiment 3 provides a method for embedding a hidden tracking watermark in a Word document on the basis of embodiment 1, and this embodiment 3 further defines that the method also includes the following steps:

[0062] S4: When the Word document is modified and the modification is saved, delete the original bookmark in the Word document, and add a new bookmark, the new bookmark contains the original URL string;

[0063] S5: Process the new bookmark according to the method described in steps S2 and S3, and place the new bookmark at a random position in the outer edge area of ​​the text.

[0064] Every time the Word document is modified, a new bookmark is regenerated, and each new bookmark is randomly placed at a different position on the outer edge of the text, thereby reducing the probability of the watermark being detected by the detection software through the fixed position detection method.

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Abstract

The invention provides a method for embedding a hidden tracing watermark in a Word document. The method includes the steps that a bookmark is added in the Word document, and watermark content is added in the bookmark and set to be hidden; the bookmark is replaced with an InlineShape object, and the InlineShape object is set to be invisible; the InlineShape object is converted into a Shape object, and the Shape object is placed at a random position of a marginal area outside the main body. According to the method, the hidden watermark is added in the marginal area outside the main body of the document and set to be invisible, on one hand, the situation that the watermark affects display of original document content is avoided, and on the other hand, the situation that a user modifies or deletes the hidden watermark due to misoperation in the use process can be avoided as the area is not touched in normal operation of the user; meanwhile, the probability that the watermark in detected by detection software can be reduced by determining the watermark addition position randomly. In this way, the problem that hiding and protection of a hidden watermark in Word can not be achieved can be solved.

Description

technical field [0001] The invention belongs to the technical field of information security, in particular to a method for embedding a hidden tracking watermark in a Word document. Background technique [0002] The document leakage traceability technology for Microsoft Word is a technology to track when and where a Word document is opened. This technology can be applied to the following situations: [0003] 1. After a protected document is stolen or opened by a user who has no right to access it, the original document holder can use this technology to know when and where the document was opened by others in a timely manner; [0004] 2. When the machine is implanted with malicious software, if the file of the machine is stolen and opened by hackers, the user of the machine can know; [0005] 3. If you need to obtain the network address of the specified object, you can send a specific Word document to the target object through this method, and you can obtain the other party's...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/16G06F40/12
CPCG06F21/16G06F40/12
Inventor 史记戴戈阮功
Owner 北京司马科技有限公司