şahin, yasin karadeniz teknik üniversitesi - fen bilimleri enstitüsü - bilgisayar mühendisliği, Trabzon, Turkey , ulutaş, güzin karadeniz teknik üniversitesi - fen bilimleri enstitüsü - bilgisayar mühendisliği, Trabzon, Turkey , imamoğlu, mustafa bilgehan karadeniz teknik üniversitesi - fen bilimleri enstitüsü - bilgisayar mühendisliği, Trabzon, Turkey

A fragile zero watermarking schema to check integrity of relational databases based on discrete cosines transform

41134

Nowadays rapid increase of the internet usage makes the data easilyaccessible. On the other hands, this situation arises another problem likeprotection of the database integrity. In recent years, database integrityprotection becomes more popular and number of the works in this fieldis increasing in each day. Most works which are related with relationaldatabases hides watermark information, which is generated from thecurrent database, into the same database. This situation causes the datacorruptions, which may be tolerable, on the database itself. Proposedmethod applies zero database watermarking scheme by transferringwatermark information as a side information. The method divides thedatabase into groups as the first step and then Discrete CosineTransform (DCT) is applied by the method on each group which isrepresented by a matrix. Computed DCT coefficients are labeled as zeroor one according to their signs. After computing coefficients andlabeling operations for each groups, the watermark information forwhole database will be obtained by concatenating groups’ watermarks.Computed DCT coefficients will change if any modification has beenoccurred on the database and any attack could be detected at the grouplevel. DCT is used by the method to obtain watermark information fromthe database at first time in the literature. Experimental results indicatethat the proposed method can detect tampering on the database withfiner accuracy compared to similar works.

887

Digital watermarking , Checking integrity of database , Fragile zero watermarking , Discrete cosines transform , Distortion and attack detection

Pamukkale University Journal Of Engineering Sciences

897