Computer virus severely threats network security and new virus emerges while the old one is still spreading. In this paper, inspired by natural immune system and biological evolution theory, we propose a novel architecture for the computer network to improve its security and survivability.Borrowing methods from the complex network theory and epidemiology, some factors involved in the network survivability are analyzed, including network topology,distribution of immune node, the life-span of antigen and antibody and gene service mutation etc. A scale-free network model, characterized by Internet etc., is also proposed to study the sensitivity of those factors.
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