A Survey on Reversible Data Hiding in Encrypted Image

Recently more attention is paid to reversible data hiding (RDH) in encrypted images, since it maintains the excellent property that the original image cover can be losslessly recovered after data embedded is extracted while protecting the image content’s as confidential. In this survey paper different reversible data hiding methods are analyzed. All previous methods embed data by reversibly vacating room from the encrypted images, which may be subject to some errors on data extraction and/or image restoration. And the method by reserving room before encryption with a traditional RDH algorithm, it is easy for the data hider to reversibly embed data in the encrypted image. This paper also concerns with a method that embeds image/ text data invisibly into a video based on Integer Wavelet Transform and to minimize the mean square distortion between the original and watermarked image and also to increase Peak signal to noise ratio. The transmission and exchange of image also needs a high security. Cryptography is used to maintain security KeywordsReversible data hiding, image encryption, privacy protection,Integer wavelet Transformation