Full metadata record
DC FieldValueLanguage
dc.contributor.author郭政忠en_US
dc.contributor.authorCheng-Chung Kuoen_US
dc.contributor.author陳玲慧en_US
dc.contributor.authorDr.Ling-Hwei Chenen_US
dc.date.accessioned2014-12-12T02:22:56Z-
dc.date.available2014-12-12T02:22:56Z-
dc.date.issued1999en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#NT880394020en_US
dc.identifier.urihttp://hdl.handle.net/11536/65514-
dc.description.abstract同一份文件可以利用幾近不可覺的方法如重新定位或修改每一行或每一個字出現的位置而得到許多不同的版本。每一個版本實質內容相同,但卻可以在文件中隱藏著視覺不可察之擁有者相關資訊。一旦後來出現未經許可的傳播,就可以藉此去查出這份文件的原始擁有者,以達到版權保護的目的。 然而將資訊隱藏在一份文件檔中是很困難的。這乃因為文件檔不像影像或是聲音有大量的多餘資訊可供隱藏資料。我們可對一張影像做些微的更改而不會被人查覺,然而假如我們對一份文件檔做修改,即使只是一個字元或是一個句號,都很容易被發覺有異。因此,對文件做資訊隱藏乃是要發現那些可供修改而不被察覺的地方。 目前已有一些方法被提出,然而這些方法在資料擷取時需要有原始文件。因此此類方法實用性很低。在本篇論文中,我們將提出一不需原文件的資料隱藏法。此方法主要是先將文件檔轉成postscript檔,再將機密資訊透過行距或字距調整達到隱藏資料目的。在擷取資料時,可由postscript檔直接抽取,亦可列印出來,看成一張影像,利用影像處理之技巧擷取機密資訊。實驗結果顯示此方法相當有效。zh_TW
dc.description.abstractEach copy of a text document can be made to be different in a nearly invisible way by repositioning or modifying the appearance of text such as lines or words. Through this way, the information of the original owner can be embedded in a text document. Thus, if the text document is illicitly disseminated, the original owner information can be extracted to prove the illegal use. This will reach the goal of copyright protection. Some methods have been provided to hide data in text files. However, most of these methods need the original file to do data extraction, this is impractical. In this paper, we will provide a method to hide data in text document. And the hidden data can be extracted directly without referring to the original file. The method first converts the text document to a postscript file, then the secret data is embedded in the file by adjusting the spaces of lines or words. The hidden data can be extracted directly from the postscript file or a printed copy. Experimental results are also given to show the effectiveness of the proposed method.en_US
dc.language.isoen_USen_US
dc.subject資訊隱藏zh_TW
dc.subject文件檔zh_TW
dc.subject版權保護zh_TW
dc.subjectData Hidingen_US
dc.subjectPostScript Fileen_US
dc.subjectCopyright Protectionen_US
dc.title資訊隱藏於文件檔之研究zh_TW
dc.titleA Study on Data Hiding for PostScript Fileen_US
dc.typeThesisen_US
dc.contributor.department資訊科學與工程研究所zh_TW
Appears in Collections:Thesis