Secured Overlapping Technique for Digital Watermarking

Abstract

Information security is a mandatory issue in current information technology world. A secure overlapping method is proposed in this paper whose key functionality is to distribute the key words at different places inside an image. It requires the extraction of overlapping blocks of image of the size of 4x4 matrixes and taking its transpose. Afterwards arranging the block to linear form row-by-row and applying watermark on it, and finally converting the block back to its original form just like the first step. This technique results in the distribution of hidden data within the block. This scattering of data is beneficial because attacker is unable to find the precise localization of hidden data within the overlapped blocks.