مقالات رزومه احمد احمدی

With the development of Internet, the insecurity and crime is increasing. Furthermore, the ability of intruder tracing, is deterrence to insecurity and it can solution for passive defense. One of the methods of intruder tracing is network flow watermark. In this technique, the pattern of network flow is changed, to watermark the special flow of traffic and we can be tracing it in the output boundaries of the network. Several methods have been proposed to watermarking the network flow on the timing of their actions. In this study, after investigating all the different methods, these classified into two categories, interval between the packages and based on the time window and compare their methods with specific criteria. Finally, we show that the combination methods and Spread Spectrum methods strength and performance is higher than other methods.