本文選題：文本數(shù)字水印　切入點：拓撲結構　出處：《電子科技大學》2008年博士論文　論文類型：學位論文

【摘要】： 近年來,隨著以互聯(lián)網技術為代表的信息技術的迅猛發(fā)展,各種文字、圖像、聲音、視頻等媒體的獲取、保存與使用方式發(fā)生了很大的變化。這一方面給人們帶來了極大的方便,但另一方面,未經版權所有人許可對數(shù)字作品的任意復制、修改等盜版行為也日趨嚴重。因此,如何在互聯(lián)網環(huán)境下進行有效的版權保護等信息安全問題,也就成為了重要的研究課題。 在此背景下,數(shù)字水印技術作為一種新的多媒體信息安全保護技術應運而生。它將隱藏信息嵌入到各種數(shù)字媒體中,結合傳統(tǒng)的數(shù)據加密技術來實現(xiàn)信息的隱藏通信、訪問控制、版權保護等功能,當前,該領域的研究與應用已經相當深入。但令人遺憾的是,由于文字媒體本身的一些特點,作為數(shù)字水印技術重要組成部分的文本數(shù)字水印技術的進展卻是相對滯后的,這與文字是人類傳播信息最主要方式的現(xiàn)實情況形成了很大的反差。 本文的工作就是要針對現(xiàn)有文本數(shù)字水印技術存在的薄弱環(huán)節(jié),進行新型的文本數(shù)字水印技術及其典型應用的研究。主要的研究內容涉及文本數(shù)字水印嵌入算法、水印檢測方法、系統(tǒng)實現(xiàn)框架、抗攻擊技術及典型應用等該領域的關鍵問題,取得了如下創(chuàng)新性成果: 1)提出了一種基于字符拓撲結構的文本數(shù)字水印技術,通過改變字符或者字符串字形的拓撲結構,設計出語義上相同的字符(串)的多種字形,并對這些字形的拓撲結構進行恰當?shù)木幋a,利用字符(串)的拓撲結構來攜帶數(shù)字水印信息。同時,給出了魯棒性和視覺影響試驗方法、結果,并分析了水印的抗攻擊性能。 2)引入圖論作為1)所述的文本數(shù)字水印技術的數(shù)學基礎,將字符字形映射為圖論中的“圖”,對“圖”或者“圖”的特征量進行恰當?shù)木幋a,利用這些編碼來表示數(shù)字水印。同時,給出了基于圖論的水印嵌入、檢測方法的數(shù)學模型和詳細實現(xiàn)過程。 3)提出了一種以符號的冗余編碼表示隱藏信息的隱藏數(shù)據通信技術,以及與該方法相關的文本數(shù)字水印嵌入、檢測技術和載體文件的顯示技術。這些技術包括:將符號編碼成冗余數(shù)字代碼的若干方法;隱藏通信的數(shù)據加載與分離方法;特定字體文件的設計方法;若干對嵌入水印信息的載體文件進行顯示的方法。在此基礎上,利用冗余編碼的原理,還提出了一種利用索引值嵌入隱藏信息的圖像數(shù)字水印算法。 4)結合基于“字符拓撲結構”和“冗余編碼”的文本數(shù)字水印技術的特點,提出了文本數(shù)字水印系統(tǒng)完整解決方案。給出了兩種特殊的字體設計方法,重點描述了在統(tǒng)一的框架體系中,實現(xiàn)在電子文件和印刷品文件上嵌入、檢測數(shù)字水印的技術。 5)提出了一種新的隱藏通信方法,其原理是改變字符圖形與字符編碼在各種編碼標準規(guī)范中已確定的標準映射關系,采用自定義的方法進行字符圖形與字符編碼的映射,從而使得電子文件顯示出的字符圖形與電子文件的內在編碼分別構成顯式通信信道和隱藏通信信道,這兩種信道可以獨立地進行通信。應用該隱藏通信技術制作成自包含字符圖形和編碼信息的電子文件,便于利用現(xiàn)有互聯(lián)網搜索引擎按照文件的屬性進行在線搜索。 6)針對同步攻擊這一困擾擴頻水印技術的難題,研究了一類基于字符特征的文本數(shù)字水印技術的編碼映射規(guī)則,給出了相應的擴頻水印加載與檢測模型。利用字符語義在水印加載與檢測過程中具備的良好魯棒性,通過載體字符產生偽隨機代碼,最終生成具有同步錯誤修正能力的自適應擴頻文本水印,仿真實驗表明其抗同步攻擊性能得到了顯著的提高。 7)提出了一種新的數(shù)字內容網絡出版發(fā)行機制,其主要特點是用戶可免費獲取數(shù)字內容,但必須強制性地觀看廣告,廣告與數(shù)字產品關聯(lián)綁定。描述了這種機制的系統(tǒng)體系結構及相關技術協(xié)議,給出了實現(xiàn)該機制所需的內容加密、水印嵌入、屏幕字符替換等關鍵技術。該機制為平衡數(shù)字內容價值鏈中各方的利益提供了一種新的解決途徑。
[Abstract]:In recent years, with the rapid development of Internet technology, the information technology represented a variety of text, images, sound, video and other media access, great changes have taken place in the preservation and use. This has brought great convenience to people, but on the other hand, without any copyright license for digital the works of replication, modification of piracy has become more and more serious. Therefore, how to protect the copyright and other information security problems effectively in the Internet environment, has become an important research topic.
Under this background, digital watermarking technology as a new kind of multimedia information security technology came into being. It will hide the information into digital media, communication, hidden combined with traditional data to realize information encryption technology and access control, copyright protection and other functions, the current research and application in this field but has been very thorough. Unfortunately, due to some characters of the media itself, as progress is the text digital watermarking technology is an important part of the digital watermarking technology is lagging behind, this is the reality of human communication of information the main way to form a great contrast with the text.
The work of this paper is to aim at the weak link existing text digital watermarking technology, research on text digital watermarking technology model and its typical applications. The main content of this study relates to a text digital watermarking algorithm, the watermark detection method, system framework, key problems of anti attack technology and the typical applications of the field, are as follows innovative achievements:
1) proposed a text digital watermarking technology character based on topological structure, by changing the topology character string or character, design a semantic same character (string) of the glyphs and the topological structures of these glyphs are using the character encoding, (string) topology to carry digital watermarking information. At the same time, the results are robust and visual impact test method, and analyzes the anti attack capability of the watermark.
2) 1) introduction of graph theory as the mathematical basis of the text digital watermarking technology, the character glyph mapping for the term "graph", proper encoding of the "map" or "map" feature, use the encoding to represent digital watermarking. At the same time, the watermark embedding is proposed based on graph theory the detection method, the mathematical model and the realization of the process in detail.
3) presents a redundancy encoding symbols of hidden data communication technology of information hiding, and associated with the method of text digital watermarking, display technology, detection technology and vector files. These technologies include: the symbol encoding method into several redundant digital code; loading and separation method of data hiding communication; the design method of specific font file; display method of vector file embedded watermark information. On this basis, using the principle of redundancy encoding, proposes a binary image digital watermarking algorithm to embed hidden information by using the index.
4) based on the character of topological structure and redundancy encoding of text digital watermarking technology, proposed a complete text digital watermarking system solution is given. Two kinds of special font design method, described in the uniform framework, the realization of the embedded in electronic and print files. Detection of digital watermarking technology.
5) proposed a new hidden communication method, its principle is the standard mapping change character graphic and character encoding standard in various encoding has been identified, the mapping method of custom character graphic and character encoding, the encoding characters and graphics and electronic documents so that electronic documents show the respectively. The explicit communication channel and hidden communication channel, the two channel can independently communicate. Application of the self made electronic file containing the character graphics and encoding information hiding communication technology, to facilitate the use of the existing Internet search engine according to the properties of the files to search.
6) in order to solve the problem of synchronization attacks that plagued the spread spectrum watermarking technology, study a class of mapping rules encoding text digital watermarking technology based on character features, gives a spread spectrum watermarking loading and corresponding detection models. Using the character semantic good robustness in embedding and detecting processes for generating pseudo-random code through. Vector of character, the generated text watermarking adaptive spread spectrum synchronization with error correction capability, simulation results show that the anti synchronization attack performance has been significantly improved.
7) proposed a new digital content network publishing mechanism, its main characteristic is that users can free access to digital content, but should be forced to watch the ads, advertising and digital products related to binding. The description of the system architecture of this mechanism and related technical agreement, the implementation of the mechanism for content encryption the key technology of watermark embedding, screen character replacement. This mechanism provides a new solution for the balance of the digital content value chain parties in interests.

【學位授予單位】：電子科技大學
【學位級別】：博士
【學位授予年份】：2008
【分類號】：TP309.7

【引證文獻】

相關期刊論文 前2條

1 蔡菲菲;劉洋;尹香蘭;;一種基于word文檔的文本水印技術研究[J];計算機科學;2012年S3期

2 沈曉艷;崔新春;于建峰;;數(shù)字水印技術在數(shù)字圖書館中的應用現(xiàn)狀分析[J];山東圖書館學刊;2011年05期

相關博士學位論文 前3條

1 吳戈;基于數(shù)字水印的文本信息隱藏方法的研究[D];長春理工大學;2011年

2 曾高榮;數(shù)字水印的魯棒性評測建模和算法研究[D];北京交通大學;2010年

3 孔鴻濱;語義Web技術的本體安全性研究[D];云南大學;2012年

相關碩士學位論文 前4條

1 伍洋;基于文本基本特征的數(shù)字水印的研究[D];長春理工大學;2011年

2 張芙蓉;數(shù)字水印在多媒體教學資源版權保護中的應用研究[D];中南大學;2009年

3 胡瑩;基于字體顏色的文本數(shù)字水印的研究與應用[D];西安電子科技大學;2011年

4 鐘征燕;應用于數(shù)字版權保護的文本數(shù)字水印技術研究[D];北京郵電大學;2013年

，

本文編號：1557370