Research On Coverless Steganography Methods Based On Compound Document

In recent years,with the rapid development of computer Internet technology,information security is attracting more and more people’s attention.As an important branch in the field of network data security,information hiding technology reduces the perceptibility of secret information by building a relationship with the carrier,so as to achieve paralysis for unauthorized persons.Has a very wide range of applications.The traditional information hiding technology achieves the embedding of secret information by modifying the redundant features of the carrier itself,which changes the fundamental properties of the carrier itself,and is difficult to resist the attack of steganalysis detection technology.In response to these problems,"coverless information hiding technology" came into being."Coverless information hiding technology" is based on the characteristics of the carrier itself as the embedding point.By constructing the mapping between the secret information and the carrier,the secret information can be completed without modifying the carrier.Embedded,so as to achieve the security of information transmission under the condition of open channel.Therefore,it is of great significance to carry out related research on the theory of coverless information hiding technology in the context of today’s society.With the rapid development of coverless information hiding technology in recent years,related research has continued to advance,and it has also exposed various limitations,such as low hiding capacity,high algorithm overhead,and unbalanced performance.For this reason,this paper takes OOXML document as a typical representative of compound document for research.After in-depth theoretical analysis and reading of many literatures,this paper explores and improves the existing coverless information hiding technology in view of the limitations of coverless information hiding technology.The related research work is as follows:(1)Coverless information hiding method based on the organization structure of OOXML document source file is proposed.Aiming at the limitations of the existing search-based coverless information hiding methods that generally use the text content structure for mapping design,this paper is the first to study the mapping from the perspective of compound document organizational structure and format features.The organizational structure characteristics of ’XML’ source files,the classification of OOXML documents is based on the difference of source file types and position orders,and the stability in the dynamic Internet background is achieved by establishing the mapping relationship between codewords and compound document categories.Coverless information hiding purpose for retrieval and reliable transmission.The experimental results show that the method enhances the real-time and dynamic of the hiding process under the premise of satisfying the success rate of 100% hiding,and also improves the hiding capacity to a certain extent under the similar number of documents.(2)Coverless information hiding method for OOXML documents based on multiple spatial mapping is proposed.In view of the existing search-based coverless information hiding methods,the research on information-free information hiding methods is generally carried out from the perspective of single-dimensional space,which makes the problem of limited hidden capacity of the existing algorithms very prominent.Starting from the above,the multi-dimensional embedding of secret information is realized by sequentially constructing the mapping between each hidden space and the codeword.The experimental results show that this method fully combines the characteristics of OOXML documents,and under the premise of ensuring 100%success rate of hiding,the hiding capacity is significantly improved,and it can effectively resist the existing steganalysis detection technology analysis.(3)A multi-modal coverless information hiding verification system based on OOXML document is designed and implemented.Using Python 3.5 as the software design platform,the design and implementation of the multi-modality of the algorithm selection and transmission mode of the sender and the receiver,the real-time performance of the mapping carrier set,etc.,and the realization of the multi-PC-side collaborative information hiding process without carrier.The test results show that the verification system can effectively complete the coverless information hiding process under multi-modality.