| 研究生: |
柯祈宏 Ke, Chi-Hung |
|---|---|
| 論文名稱: |
關連式資料庫之浮水印技術研究 A study of watermarking in relational database |
| 指導教授: |
王明習
Wang, Ming-Shi |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 工程科學系碩士在職專班 Department of Engineering Science (on the job class) |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 97 |
| 中文關鍵詞: | 關連式資料庫 、浮水印 |
| 外文關鍵詞: | watermarking, relational database |
| 相關次數: | 點閱:173 下載:4 |
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資料庫系統和一般之數位資料一樣,都具有容易被複製的特性。近年來由於網路傳輸速度的不斷增加,使得資料庫更容易地被傳輸與交流。因此保護資料庫內容的智慧財產權確有其必要性以及急迫性。
本論文除介紹目前關連式資料庫浮水印的相關技術外,並提出針對關連式資料庫中嵌入圖形浮水印的方法,藉此來保護資料庫的智慧財產權。本方法考慮對數值欄位來嵌入浮水印,且假設這些數值欄位皆允許被細微的修改,再利用量化的觀念將圖形的像素值轉換成十個阿拉伯數字符號的數字來嵌入這些數值欄位中。萃取時則利用三次多數決的方法來修正因各種攻擊所造成的誤差。本方法透過圖片易於辨識的特性來提高浮水印萃取出來的明確性,再經由重覆的嵌入圖片來增加資料庫浮水印的強韌性。實驗結果證明,本論文所提出的方法是可行的且具有相當高的強韌性。
Like digital data, a database system is also easily to be duplicated and exchanged. To protect the content of a database system is necessary and urgent. In this thesis, except to servey the related techniques that have been used to discuss the watermarking methods for relational database, a novel watermarking method was proposed for the same purpose. The proposed method embeds an image watermark into the relational database under the assumption that the muneric attributes allowed a slight modification. The pixels values of the image watermark are quantized into ten levels to match the representing range of numeric attributes. Duplicated watermarks are embedded for increasing the robust of the proposed method. Majority voting method was adopted to extract the embedded watermarks for considering different kinds of attacks. The experimental results are verified and compared with some exsited methods. It is shown that the proposed method is practical and more robust than that of the discussed exsiting methods.
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