Research On Block Based High Capacity Image Data Hiding Schemes

The 21st century is the era of rapid development of the Internet.A variety of new Internet technologies were born,such as big data,cloud computing,cloud storage and artificial intelligence.These new technologies change people's way of life and improve people's life quality.However,the rapid development of the Internet also faces serious security problems,such as illegal eavesdropping,interception and malicious tampering with data.Researchers pay more and more attention to relevant information security field.As an important branch in the field of information security,data hiding is a technology that embeds the important secret message into common used digital multimedia data,such as audio,text,image,and video,and aims to make the transmission of secret message invisible.However,compared with the traditional cryptography,the research on data hiding technology is still in an emerging stage.There are still many key problems that need to be explored and solved.Therefore,it is of great significance and value to study efficient data hiding techniques.After collecting and analyzing a large number of relevant research results in image data hiding field in the world,we note that most image data hiding schemes divide the original cover image into non-overlapping small blocks,and then use each block as a minimal data hiding algorithm-processing unit for program design.Using the block idea,the space complexity of the data hiding algorithm can be reduced,the algorithm is more concise,efficient,easy to implement,and convenient for future modification and optimization,more important,more suitable for the complicated network environment.In order to design a more efficient data hiding scheme,this paper deeply studies a large number of data hiding schemes and related knowledge,then proposes two image data hiding algorithms based on blocks with higher embedding capacity.The specific research contents are shown as follows:(1)Sudoku-based data hiding technology is a novel data hiding method in recent years.It begins from the mathematical characteristics of Sudoku and makes data hiding algorithms based on it with higher security.This paper presents a high-capacity data hiding scheme based on Sudoku game,which expands the usage of Sudoku,not only as a reference matrix for data hiding but also participating in the data hiding algorithm.On the other hand,it also increases hiding capacity and improves data hiding algorithm security which can prevent violent crackdown more effectively.The data hiding algorithm can also promote the use of other different order of the Sudoku matrix,so it has good scalability and adaptability.(2)Because most of the digital images in Internet are compressed,the transform domain is used to hide secret message on these compressed images.However,many block-based data hiding schemes are proposed on the spatial domain but cannot be applied directly to the transform domain.In this paper,a block-based high-capacity reversible data hiding scheme for JPEG image is proposed.After studying the algorithm characteristics of(7,4)Hamming code and histogram shift,our scheme combines them and achieves the purpose of making full use of AC coefficient in DCT block.This scheme improves the embedding capacity and maintains a good visual quality,more important,has good security(hard to perceive by third parties).It also can use different quality factors to meet the user's different hidden needs.If the sender has larger number of secret bits to hide,selects lower quality factor for compression image.If the sender needs stego image has a higher visual quality to avoid being suspected by third-party eavesdroppers,a higher quality factor should be a better choice.