A robust watermarking approach for non numeric relational database

One of the major issues concerning all the web application is security of data and proving authority of database. In this paper we present a robust technique of embedding watermark in a relational database with non numeric attributes. In the proposed technique, an attribute is selected using a pseudorandom generator and the watermark is embedded in it. The vowel to be embedded is selected by calling a Key_Extraction ( ) on primary attribute of the same tuple. Our technique develops a secret key of embedded vowels which is provided to the user. The technique is robust against different malicious attacks and is blind and imperceptible, as proved by our analysis.