Abstract:With the encryption technology and information hiding theory,a new reversible data hiding scheme in encrypted images is proposed.The proposed scheme firstly encrypts the original image by encryption key,and then divides the encrypted image into blocks and generates a template matrix randomly.Data hiding processing with higher capacity can be performed by the template matrix with multiple rotation angles.Aiming at an encrypted image containing additional data,the proposed scheme decrypts it to obtain a version that is similar to the original image.Since previous methods do not fully exploit the border pixels in calculating the spatial correlation,the proposed scheme designs a more accurate fluctuation measurement.The embedded data can be successfully extracted and the original image can be perfectly recovered.Experimental results show that the proposed work has better performance in capacity and error rate of extraction than that of other methods.