The Design Of Steganographic Method For Text Without Carrier Based On The Characteristics Of Chinese Characters

Thanks to the rapid development of computer and multimedia technology and the wide application of digital communication technology,the transmission and communication and sharing of the information are mostly realized through the digital way in the network,which brings great convenience to people but also brings a lot of unnecessary troubles.More and more secret information is transmitted in the network,the secret information is easily stolen by attackers due to the insecure existence of the network,at this time,information hiding technology plays an important role.At present,the digital information carriers used on the network mainly include text,image,video,audio,protocol and so on,these digital information carriers can be used as carriers for steganography research.Among them,the text is the most widely used on the Internet,therefore,this thesis will focus on the research of coverless text steganography.Aiming at the problems such as low hidden capacity,poor imperceptibility and low success rate in the existing text steganography methods,this thesis proposed two text steganography methods,which are combined with Chinese character structures,Chinese character strokes,and Chinese remainder theorem.The work of this thesis includes the following aspects:(1)After analyzing and statistic,the Chinese character structure and Chinese character strokes are classified and verify the Chinese character structures and strokes can be mapped with the binary "0" and "1".It is concluded that it is feasible to apply the structures and strokes of Chinese characters in the steganography methods.(2)A coverless text steganography method based on Chinese character structures is proposed.It uses different Chinese character structures to represent different binary "0" and "1" combinations.Extracting the position information of binary combinations that can express the secret information from the encoding matrix of Chinese character structures that converted by the carrier text.construct a system of the linear remainder equations by using the Chinese remainder theorem,and its solution is the key.The results show that this method has better imperceptibility,extensibility,and robustness while guaranteeing the hiding capacity.(3)A text steganography method based on the Chinese character strokes coding matrix is proposed.This method establishes a dynamic mapping relationship between Chinese strokes and binary to make Chinese characters with standard strokes order can represent the secret message.Searching on the Internet to find a text carrier which includes the Chinese words that its stroke can represent secret information.The big data network environmentprovides a rich space for the selection of the text carriers,ensuring the success of steganography.In summary,the two steganography methods proposed in this thesis have the well hidden capacity,security,and the success rate,the overall performance is superior to other steganography methods,therefore,this thesis provided new ideas for information hiding technology.