Research on the Survivability of Network information System

Network survivability refers to that the system can still fulfill its key tasks when it is suffering attacks, failures or accidents. Survivability has become a new aspect in network security. It can better satisfy the current situation of network application in contrast to the traditional security concepts and technologies such as information protection and assurance. It also gives a new way to research the network security. Firstly, an analysis of the difference between survivability and traditional security concepts is made. Then,the paper gives out the definition, measurement and characteristic implementationtechnology of survivability. Finally, it introduces two methods to realize the survivability and analyzes the difference between the two methods.