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Method and system for generating digital watermark-based safe word stock

A technology of digital watermarking and generation algorithm, applied in the field of information security, can solve the problem of document security cannot be guaranteed, and achieve the effect of protecting illegal copying

Inactive Publication Date: 2010-09-15
SHENZHEN Y& D ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For any specific font library, it is common to all users. The content of the font library only contains the content required for font display without any additional content, and there is no hidden information content, which makes Document security cannot be guaranteed

Method used

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  • Method and system for generating digital watermark-based safe word stock
  • Method and system for generating digital watermark-based safe word stock
  • Method and system for generating digital watermark-based safe word stock

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Embodiment Construction

[0028] The framework of generating the safe font library based on digital watermark described in the present invention can be described as a seven-tuple: (I 0 , K, Inf, W, G, E, D), where, I 0 One or more sub-fonts selected from the original font collection to be embedded with digital watermark; K is the set of keys; Inf is the watermark information to be embedded representing authentication information; W is the actual embedded digital watermark; The watermark generation algorithm W=G(I 0 , Inf, K); E is to embed the digital watermark W into the sub-word library I 0 The watermark embedding algorithm in, that is, I W =E(I 0 , W), where, I W D is the security font library obtained after embedding digital watermark; D is the watermark detection algorithm and watermark extraction algorithm, wherein the extraction refers to the security font library I W In the process of extracting and restoring digital watermark or watermark information, detection refers to the process of ju...

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Abstract

The invention discloses a method and a system for generating a digital watermark-based safe word stock. The safe word stock is used for establishing a user document which exclusively belongs to a user, and the method is characterized by comprising the following steps of: step S1, determining a sub-word stock which needs to be embedded with a digital watermark in an original work stock set according to the requirement of creating a document; step S2, forming watermark information based on authentication information; step S3, generating the digital watermark by using a watermark generation algorithm based on the sub-word stock, the watermark information and a key; and step S4, embedding the digital watermark into the sub-word stock by using the watermark embedding algorithm and generating the safe word stock comprising the digital watermark. The user can input characters by using the unique safe work stock so as to generate the unique document per se; and a watermark signal comprising the specific information of the user is embedded into the documents and can be extracted, so that the documents are protected from being copied illegally.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method and system for generating a digital watermark-based security font library. Background technique [0002] The font library is an important part of the computer operating system. The font library stores a collection of each character glyph, which defines the shape of the text output, the maximum resolution, and so on. When performing computer text output, first, according to the internal code of the text, find the glyph from the font library after calculating the index, then define the output size and resolution through the output device, and finally display the font output on the media. [0003] At present, commonly used fonts can be divided into dot matrix fonts and vector fonts in terms of glyph description technology. The principle of the dot matrix font library is to establish a certain rectangular area for each character, and divide this area into m×n e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F17/30
Inventor 戚建淮王明文刘智曾广良刘喜雨李佳
Owner SHENZHEN Y& D ELECTRONICS CO LTD
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