基於四分碼之文件影像隱私性保護技術

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题名:	基於四分碼之文件影像隱私性保護技術
其它题名:	Privacy Protection of Document Images Based on Quadcode
作者:	陳保凱 Chen, Pao-Kai
贡献者:	林祝興 Lin, Chu-Hsing 東海大學資訊工程學系碩士在職專班
关键词:	隱私性、四分碼、數位浮水印、資訊隱藏 Privacy, Quadcode , Watermarking, Information Hiding
日期:	2009
上传时间:	2011-03-07T07:54:07Z (UTC)
摘要:	摘要隨著電腦科技與網路通訊的普及，透過個人電腦 (PC) 與網路設備之相互連結，電腦使用者即可輕易地將訊息傳遞至世界的各個角落。資訊的傳遞因此變得更加便利與迅速，在公開的網路環境中，確保數位影像資料之安全與保障合法擁有者權益，已成了目前急待解決的問題。資訊隱藏技術 (Information Hiding) 是一種普遍的資料保護機制。藉由資訊隱藏技術可將重要的訊息秘密地嵌入於各種形式的數位媒體之中例如：數位文件、數位音訊、數位影像以及數位視訊等等。數位浮水印技術常用來保障電子文件的智慧財產權，合法擁有者可將特殊的浮水印圖像嵌入到原始文件中，用以宣告其合法擁有權，透過浮水印的驗證程序，則可證明此一文件內容的真實性與完整性。我們提出一種用來保障文件隱私的方法，將欲於網路上傳輸之文件內容，利用四分碼 (Ｑuadcode)的編碼技術來將文字嵌入至一張影像中，使其產生可視型文字浮水印的效果，用以充分保護資訊的隱私與完整性。當攻擊者從網路中攔截到已嵌入文字之影像 (Stego Image)時，仍無法正確地將正確之文字從文字浮水印中分離出來，唯有合法的接收者，才有能力從影像中回復原先藏入的明文資料。雖然浮水印影像係以文字點矩陣方式呈現，但由於正確的文件內容和其他詞句一起被打亂在背景影像中，想要從中還原出來原本的文句，將是極為困難的一件事。 AbstractFollowing popularization of computer technology and network communication, computer users can easily transmit information all over the world by interconnection of personal computers and network equipments. Transmission of information becomes more rapid and convenient; therefore, in the open network environment, protections of the security of digital image data and rights of legitimate owners have become urgent issues. The Information Hiding technology is one kind of common methods for protections of information. By means of information hiding technology, important information is embedded secretly in multimedia of many forms, including digital documents, digital messages, digital images, digital videos, etc. Digital watermarking technologies are often used for protection of the intellectual property rights of electronic documents. The legitimate owner embeds special watermarking images to the original document to acclaim his ownership. By extracting embedded watermarks, the authenticity and the integrity of contents of the document can be verified.We propose a method to safeguard the privacy of documents: before transmitting of the content of the document via the network, we use a Quadcode coding technique to embed characters into an image to have visible watermarking effects ; in this way, the privacy and the integrity of the information are secured. If hackers intercept stego-images from the network, they are unable to deduce correctly the embedded information, only the legitimate receivers are capable to recover the hidden message. Although watermarked image is displayed as a matrix of characters, since the true document contents are mixed together with other words and phrases on the image background, it will be extremely difficult for hackers to figure out the original contents from the stego-image.
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