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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 陳文進 | |
dc.contributor.author | Wen-Lan Zhong | en |
dc.contributor.author | 鍾文藍 | zh_TW |
dc.date.accessioned | 2021-06-15T12:53:07Z | - |
dc.date.available | 2016-09-13 | |
dc.date.copyright | 2016-09-13 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-07-19 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/50695 | - |
dc.description.abstract | 由於目前電子商務快速成長,消費者已習慣在 Amazon、iTunes 或 eBay 等網站購買商品,而且將來要在線上直接購買數位媒體如音樂、圖像或是影片等只會越來越常見。要保護這些數位內容的一個常見方法是採用數位浮水印。根據一些相關的研究顯示,一般的數位浮水印在遭遇幾何攻擊時並不安全,所以我們會使用基於幾何矩的浮水印方法來抵抗這種攻擊。在我們的商業模型中,數位內容的擁有者會透過數位商務公司來銷售他們的產品,同時數位商務公司必須負責將數位浮水印加入數位內容中。不過若是數位內容的擁有者不相信這些公司,那麼事先加密就可以用來保護這些有價值的數位內容。由於我們在製作浮水印的過程中引入了加密系統的緣故,所以像 Paillier 這樣具有加法同態性的加密系統就可以用來嵌入數位浮水印。然而,加密後的數位內容檔案大小相當大,所以在本文中,我們利用中國剩餘定理來克服加密後檔案資料劇增這個加密技術中常遇到的難題。 | zh_TW |
dc.description.abstract | With the rapid growth of e-commerce, consumers getting used to buy goods from e-trading websites, and buying digital media such as music, images, and videos directly online become more and more popular. To protect the digital products, digital watermarking is a commonly adopted approach. According to some relative researches, general watermarking schemes are not robust enough while undergoing the geometric attacks. Facing this challenge, the well-performed moment-based watermarking techniques are utilized to against these attacks. Moreover, in our commerce model, content owners sell or delegate their products to e-commerce service providers (or reselling agents) and these delegations are responsible for embedding watermarks into the content. Nevertheless, if content owner does not trust the delegations, doing encryption is helpful in protecting treasurable contents in advance. Therefore, we include an effective cryptosystem into our watermarking procedures. Since additive homomorphism is a must for directly conducting watermark embedding in the encryption domain, the well-known additive homomorphic cryptosystem: Paillier is taken into account. Finally, the encrypted content size will be enlarged, with the aid of Chinese Remainder Theorem, we will show how to deal with this commonly faced troublesome issue in doing encryption. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T12:53:07Z (GMT). No. of bitstreams: 1 ntu-105-R03922134-1.pdf: 2338861 bytes, checksum: 0dd3e638f67708ca4f23153fabc8c9b0 (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 口試委員會審定書 i
誌謝 ii 摘要 iii Abstract iv List of Figures vii List of Tables viii 1 Introduction 1 1.1 Affine-Resistant Watermark 1 1.2 Joint Encryption and Watermarking Schemes 2 1.3 Secure Client Side Watermarking 3 1.4 Additive Homomorphic Cryptosystem 4 1.5 Contributions 4 1.6 Thesis Organization 5 2 Preliminary 6 2.1 Notations 6 2.2 Normalization 6 2.3 Geometric Moments and Central Moments 7 2.4 Normalization Procedure 8 2.5 Paillier Cryptosystem 9 2.6 Chinese Remainder Theorem 10 3 Proposed Method 11 3.1 The Proposed Secure Online Content Delivering Scheme 11 3.2 Encryption of the Original Image Pixel by Pixel 12 3.3 Watermark Embedding 13 3.4 Content Decryption 14 3.5 Watermark Extraction 14 4 Reconstruction by CRT 16 4.1 Enlarge the Plaintext 17 4.2 Additive Property of CRT Reconstruction 18 4.3 Find k Pairwise Coprime Integers 19 4.4 Watermarking with the Aid of CRT Reconstruction 21 4.5 Analysis 25 5 Experiments 26 5.1 Another Normalization Procedures 26 5.2 Perceptual Impact 29 5.3 Encrypted and Reconstructed Image Size 29 5.4 Recovering from Reconstructed and Encrypted Image 31 6 Conclusion 32 Bibliography 33 | |
dc.language.iso | en | |
dc.title | 藉由中國剩餘定理之可靠且安全的數位浮水印方法 | zh_TW |
dc.title | A Robust and Secure Watermarking Scheme with Chinese Remainder Theorem | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 吳家麟 | |
dc.contributor.oralexamcommittee | 朱威達,胡敏君,鄭文皇 | |
dc.subject.keyword | 數位商務,數位浮水印,幾何攻擊,圖像標準化,Paillier加密系統,中國剩餘定理, | zh_TW |
dc.subject.keyword | E-commerce,Digital Watermarking,Geometric Attacks,Image Normalization,Paillier Cryptosystem,Chinese Remainder Theorem, | en |
dc.relation.page | 35 | |
dc.identifier.doi | 10.6342/NTU201601073 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-07-19 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 資訊工程學研究所 | zh_TW |
顯示於系所單位: | 資訊工程學系 |
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ntu-105-1.pdf 目前未授權公開取用 | 2.28 MB | Adobe PDF |
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