|
Encryption technology for the security of the information has been developing rapidly for the purpose of social, political, diplomatic, and military purposes from the past. Especially, amid the information era, as the data communication and electronic commerce, people came to feel the necessity to develop the encryption along with the increasing importance of the preservation of information. Accordingly, it is necessary to develop encryption algorithm safe and reliable tit for the next generation. One of the biggest characteristics of chaos theory is that it sensitive dependency of the initial condition which means that chaos generate a big change in spite of a tiny change in the initial stage. The keystream generation method creates chaos signal using logistic difference equation, which is proposed by May, and then gets parts of signal from secure key of the external input. Finally, it creates transformed binary code from threshold and generations keystream from combination binary code. This study suggests the keystream generation method for the stream encryption system using the chaos theory and presents nonlinear characteristic on keystream that can apply effectively to the authentication, digital signature, electronic pay, and forth of electronic commerce. It generators binary keystream which is nonlinear characteristics like chaos. The characteristics of the suggested method are as follows : It is difficult to predict what will happen because it has unclear extent. It is very sensitive to the initial condition and so almost impossible to predict the pattern. There are a lot of variables on the generation of signal and so it is difficult to analysis by probability. It is expected that the keystream generation method using the chaos theory can be applied for key generation of electronic commerce and another encryption system which will be developed in the future.
|