Comparative Study of Histogram Shifting Algorithms for Digital Watermarking

Data hiding is a method of hiding or embedding secret data, called message, into a digital media, called cover; in such a way that message is unnoticeable to human eye. An algorithm that can retrieve the message from the cover without any loss to original image is called reversible. Histogram shifting has proven its importance in the field of digital watermarking after the work of Ni et al. In this paper, we will discuss about some variation of algorithms based on histogram shifting. We will further discuss about basis of our work. A multiple zero-peak points can be used for hiding the data in an efficient manner with histogram technique. Furthermore, hash will be created by using MD5 or SHA1.