By the development of Internet, people can get more resource from network. At the same time, the firewall and Intrusion Detection system (IDS) have developed too. But the evolution of the kind of intrusion method makes a new challenge to the firewall and IDS.In the paper, we introduce a technique of tunnel based on encapsulation by HTTP . By using HTTP to encapsulate other protocol or data; this technique can pass the firewall and IDS. The main content in this dissertation includes: The protocol and correlate technique are used by HTTP tunnel, and introduce she main function of these technique in HTTPtunnel. We describe the principle and main designed planning of HTTP tunnel, include the structure of module and flowing dialog of this system. We carry out the system by coding, introduce the main function and the relation between these function. In order to validate the feasibility of this system, we test the system in some way.By we studying, give the research of firewall and IDS a new way in a future. |