Li Tianmu Computer & Software department Nanjing University of information & technology Nanjing,China Zhong Weijun School of Economic and Management Southeast University Nanjing,China
<正>Information security has externality for the infection of information system security.This paper analyzed the dependent security of information systems with star topology structure considering the important factor that the infection of information security can be controlled through intercommunication infrastructure.It argues that centralization management can bring right benefit and weak systems should be increased investment when different levels of security information system are connected.In additional,the network center should strengthen the security to reduce the losses caused by information system interaction.
Star topology;;Intercommunication;;Information security;;Externality
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