An Image Encryption Algorithm Based On Chaotic Sequence

Recent years,more and more people transfer image via internet with Net-Age comes。There are a large number of digital image need to be transmited Because of the development of communication,furhtermore, gaining data becomes more and more easy through common and wireless communication by illegal method。Therefore, information security is a big problem, digital image technique is so useful and needs to be developed further more。For the security of image-transmission,all kinds of encryption algorithm came out。But message-leak means the method is not reliable,moreover,useful message can't be got by proper person。There are many disadvantages in traditional encryptions,and a lot of encryption algorithm for image-transmission were carried out。algorithm for image-transmission based on chaos system is a new field. For this algorithm,images was considered as binary codes。image data was encrypted through chaos signal。Chaotic signal is nonperiodic,continual broad-width,noise-like. Chaotic signal has great concealable character constitutionally。It is highly sensitive to initialization condition and little distortion。So Chaotic signal is quite suitable for security-communication。First,thesis introduces image encryption in Chapter 1,which is useful for our understanding of following chapters,and later in Chapter 2 introduces several basic method of image encryption,and compared each other respectively。Then in Chapter 3 introduces some basic knowledge about chaos system,including its concept,character and models。Then , in Chapter 4 introduces an new algorithm based on magic-square-algorithm which Optimized on tradition algorithm。Two traditional algorithm , magic-square-algorithm and mirror- algorithm was covered and improved in this new algorithm。It is a good combination between magic-square-algorithm and mirror- algorithm for their characteristics。And consequence will exceeds haploid encryption algorithm theoretically。Later outcome of emulational program on MATLAB flat can approve it quite well。Finally the conclusion is given, including the advantage and disadvantage of the work。...