Research On Text Steganography In Instant Messaging

The process of information transmission depends on the public network,which is prone to security problems such as message leakage.Although the existing encryption technology is becoming more and more mature,it can better realize that the information is not tampered with and identified by the third party in the transmission process,but it can not cover up the existence of secret information.Information hiding technology can make it impossible for a third party to discover the existence of secret information,and it is mainly used in text,image,voice,video,network and other carriers.Text is the most widely used,so this thesis focuses on instant messaging text steganography.Most of the existing steganography algorithms modify the structure or semantics of the carrier text.In order to solve the problems of invisibility and poor anti-detection ability,this thesis proposes two kinds of steganography algorithms suitable for instant communication.These steganographic methods integrate the text features and character features of the instant communication language and fully consider the concealment and practicability of the hiding scheme.The specific work of this thesis is as follows:? Feasibility analysis of character and text feature coding.Statistical experiments were carried out to analyze the feasibility of the parity of the number of haracters in text and the encoding of Chinese flatness.? Proposed a carrier-free text steganography method based on hamming code.This lgorithm uses the error correction feature of hamming code to send text aragraphs to realize the hiding of secret information.Modify the information ode according to the position code and get the corresponding supervision code; end the text that matches in the monitor code text library.The experimental esults show that the algorithm has better concealment without modifying the arrier.? A short text steganography method based on emoticons and character features is roposed.The algorithm embed the location information by the facial expression ark,established the mapping relationship between the secret information and he character feature,and realized the information hiding of the short text in the nstant communication.The results show that the algorithm has the advantages of trong implementation and large hiding capacity,and can be widely used in the nstant communication system.At the same time,secret information can be elected to map with various character features,which further enhances the ecurity of steganographic algorithm.? Other work.The supervision code text library and its index are built.Android overt communication application is designed and implemented.The dentification scheme for both sides of covert communication and the security valuation coefficient of multi-carrier scheme are proposed.In summary,this thesis studies the text steganography method adapted to instant communication,and specifically proposes two steganography algorithms.