Research On Image Reversible Information Hiding Method In Encrypted Domain

The reversible information hiding technology of the encrypted domain image is mainly divided into two parts.The first part is to encrypt the carrier image,so that the carrier image becomes a disordered image,and then plays a protective role in the carrier image;the second part is to embed the encrypted image,and ensure that the information is extracted without error and the carrier image is restored without distortion.This technology has significant advantages in cloud data storage and processing in mobile Internet,cloud computing and other fields.In recent years,a large number of scholars have also studied this technology.However,at present,there are some problems,such as low embedding capacity of encrypted image,incomplete recovery of carrier image,and low practicability.Based on the analysis and research of existing algorithms,this paper discusses how to improve the frequency of information embedding on the premise of ensuring data security.The main research results of this paper include two aspects:First,a reversible information hiding algorithm based on scrambled encryption and PVO technology is proposed.In this algorithm,dual scrambling encryption technology is used in the encryption phase,and in the information hiding phase,the correlation of pixels in the block is highly preserved in the encryption technology.A steganography algorithm based on pixel value prediction and sorting is proposed.In order to improve the overall effect of the scheme,the smoothness is used to classify the image blocks and the amount of embedded data is different.The simulation results and analysis show that the algorithm has better embedding quality and capacity than the traditional method.Secondly,A reversible watermarking algorithm based on identical block is proposed.This algorithm proposes the concept of identical block,and sets the block with the same pixel gray value as the identical block.The encrypted image is divided into identical block and common block,and different embedding methods are used to improve the embedding quality.In the encryption stage,we use homomorphic encryption and scrambling encryption to improve the quality of encryption.Simulation results and analysis show that the algorithm has better security and embedding quality,and has better effect for the background image with higher smoothness.Experimental results show that the two reversible information hiding algorithms proposed in this paper have excellent performance in image embedding quality and capacity.