Robust database watermaking technique over numerical data

Proving ownership rights on outsourced databases is a vital issue. This research proposed an improved algorithm for relational database watermarking to minimize data variation as well as robust watermarking. For minimizing data variation two minimizing methods are proposed, the first method avoids e...

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Main Author:	Sardroudi, Hossein Moradian
Format:	Thesis
Language:	English
Published:	2010
Subjects:	ZA4450 Databases
Online Access:	http://eprints.utm.my/id/eprint/32815/5/HosseinMoradianSardroudiMFSKSM2010.pdf
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id	my-utm-ep.32815
record_format	uketd_dc
spelling	my-utm-ep.328152017-09-19T06:28:46Z Robust database watermaking technique over numerical data 2010-12 Sardroudi, Hossein Moradian ZA4450 Databases Proving ownership rights on outsourced databases is a vital issue. This research proposed an improved algorithm for relational database watermarking to minimize data variation as well as robust watermarking. For minimizing data variation two minimizing methods are proposed, the first method avoids embedding watermark bits in attributes with small values, the second method flips one of the unmarked bits in marked attribute in order to obtain the nearest number to the original attribute value. For embedding watermark bits, this research transforms the watermark image into a two dimensional matrix elements and embeds a gray (black and white) image in a database table. Furthermore in extracting process, a recovering phase is added. Recovering phase finds the missing extracted watermark elements and increases the robustness, so that the watermark can be detected even in a small subset of a watermarked database. In extracting process, majority voting method is employed to retrieve the correct watermark. For obtaining accurate results this study uses three various images and three separate database tables with different sizes. By applying these methods, variation of data after applying watermark is extremely less and also an upper Correction Factor for watermark can be obtained. Detecting the watermark neither requires the original database nor the watermark. The results have illustrated that the proposed method are convincing compared to other related methods. 2010-12 Thesis http://eprints.utm.my/id/eprint/32815/ http://eprints.utm.my/id/eprint/32815/5/HosseinMoradianSardroudiMFSKSM2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Computer Science and Information System Faculty of Computer Science and Information System
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	ZA4450 Databases
spellingShingle	ZA4450 Databases Sardroudi, Hossein Moradian Robust database watermaking technique over numerical data
description	Proving ownership rights on outsourced databases is a vital issue. This research proposed an improved algorithm for relational database watermarking to minimize data variation as well as robust watermarking. For minimizing data variation two minimizing methods are proposed, the first method avoids embedding watermark bits in attributes with small values, the second method flips one of the unmarked bits in marked attribute in order to obtain the nearest number to the original attribute value. For embedding watermark bits, this research transforms the watermark image into a two dimensional matrix elements and embeds a gray (black and white) image in a database table. Furthermore in extracting process, a recovering phase is added. Recovering phase finds the missing extracted watermark elements and increases the robustness, so that the watermark can be detected even in a small subset of a watermarked database. In extracting process, majority voting method is employed to retrieve the correct watermark. For obtaining accurate results this study uses three various images and three separate database tables with different sizes. By applying these methods, variation of data after applying watermark is extremely less and also an upper Correction Factor for watermark can be obtained. Detecting the watermark neither requires the original database nor the watermark. The results have illustrated that the proposed method are convincing compared to other related methods.
format	Thesis
qualification_level	Master's degree
author	Sardroudi, Hossein Moradian
author_facet	Sardroudi, Hossein Moradian
author_sort	Sardroudi, Hossein Moradian
title	Robust database watermaking technique over numerical data
title_short	Robust database watermaking technique over numerical data
title_full	Robust database watermaking technique over numerical data
title_fullStr	Robust database watermaking technique over numerical data
title_full_unstemmed	Robust database watermaking technique over numerical data
title_sort	robust database watermaking technique over numerical data
granting_institution	Universiti Teknologi Malaysia, Faculty of Computer Science and Information System
granting_department	Faculty of Computer Science and Information System
publishDate	2010
url	http://eprints.utm.my/id/eprint/32815/5/HosseinMoradianSardroudiMFSKSM2010.pdf
_version_	1747816067178168320

Robust database watermaking technique over numerical data

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