Research Of The Network Survivability Based On The RAPTOR Fault-Tolerant Model

Network survivability, the kernel of the next generation of network security research, is becoming more and more attractive as the threats to the networks cannot be removed completely. It emphasizes on the idea that networked information systems will still be able to maintain the critical services in the face of attacks, faults and accidents. In 2000 John C. Knight proposed the Willow survivability model, which is based on the notion of control. The Willow survivability model is one of the most effective theory frameworks among all the network survivability models exist, thus it is accepted by more and more scholars and researches. RAPTOR (Reconfiguring Application Programs To Optimize Recovery) fault-tolerance model is derived from the Willow control model, and it specifies the error detection and recovery and its architecture model by means of a formal language system so that they can be easily understood and demonstrated, and thus lead to a new direction in the research of survivability.As a beginning this paper makes a brief description of the research background of network survivability, distinguishes it from traditional network security and then shows the reason for the research on it. Then the definition, the basic elements and the measurement of the network survivability are given for further understanding. A fault-tolerance model based on the RAPTOR is proposed and the principles and the execution process are analyzed. In the final part the evaluation on the effectiveness of this fault-tolerance model is implemented in an experiment system.