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Article
Watermarking for Relational Database by using Threshold Generator

Authors: Bashar Saadoon Mahdi --- Yossra H. Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 1 Pages: 33-43
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Providing ownership on relational database is a crucial issue in todayinternet-based application environments and in many content distributionapplications.This paper provides the effective watermarking technique to protectvaluable numeric relational data from illegal duplications and redistributions aswell as to claim ownership,the robustness of proposed system depending on usingnew hybrid techniques ,first technique MAC(Message Authentication Code) thatused one way hash function SHA1 ,second technique is threshold generator baseon simple combination of odd number of register and by using secret key inproposed system. Detecting the watermark neither requires access to neither theoriginal data nor the watermark. The watermark can be detected even in a smallsubset of a watermarked relation as long as the sample contains some of the marks.The finally stage is the analysis of technique that used, our extensive analysisshows that the proposed technique is robust against various forms of maliciousattacks and updates to the data


Article
Random Insertion Watermarking By Computing Angle Between Two Lines In Blue Components On Postage Stamp

Author: Nada Mahdi al- Husseiny
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 7 Pages: 1308-1328
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents a new approach for watermarking by using geometric analyticand mathematical model providing robustness to embed the watermarking in postagestamp (ps) image, using the angle between two lines to insert the embeddedinformation in blue component for pixels. Analytic geometry, also known ascoordinate geometry, or Cartesian geometry, is the study of geometry using acoordinate system and analysis. The modern and advanced meaning refers to thegeometry of analytic varieties, to develop a data-hiding method that has a goodperformance in color images. Furthermore, the watermark must be either robust orfragile; depending on the application. The expression "robust" in this paper refers tothe capability of the watermark to resist manipulations of the media. Two types ofwatermarked attack was used; the JEPQ compression as lossy compression (wherecompressing and decompressing data retrieve hidden information that may be closeenough to the original image), and the enhancement filter (mean filter). This proposedwatermarking system refers to the watermark objective evaluation test or (WOET).

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