Reversible Data Hiding in Encrypted Images

In recent times, more attention is paid to reversible data hiding (RDH) in encrypted images, since it preserves the excellent property that the original cover can be losslessly improved after embedded data is extracted while protecting the image contents privacy. All earlier methods embed data by reversibly vacating room from the encrypted images, which may be raise some errors on data extraction and image restoration. In this paper, we proposed a novel method by reserving room before encryption with a traditional RDH algorithm, and thus it is easier for the data hider to reversibly embed data in the encrypted image. Proposed method that can achieve the real reversibility, data extraction and image recovery are free of any error. This Experiments show that this novel method can embed more than 10 times as large payloads for the same image quality as the earlier methods, such as for PSNR dB.