Abstract: Recently, the rapid development in information technology more and more images and data are available on the internet .So there is a need to provide authentication to important data. Security and integrity of data are two challenging areas for research. There are number of techniques to secure the data. Reversible data hiding is a technique that is used to hide data inside an image. The data is hidden in such a way that the original data is not visible. All previous methods embedding data into image by reversibly vacating room in the encrypted images, which may be result as some errors on data extraction. That mean some secrete information is loss in data extraction. In this paper, we propose a novel method by reserving room before encryption with a traditional RDH algorithm, and thus it is easy for the data hider to reversibly embed data in the encrypted image .This method provides improved PSNR ratio and recovers image with its original quality.
Keywords: Reversible Data Hiding, image encryption , PSNR.