摘要

The security defense of Electric Power Information Network should focus on the security of network business running on Intranet. In order to meet the special requirements of network business security in Electric Power Information Network, the access rules of network business between different security levels are researched, and a network business security model based on developed BLP model is proposed. By re-definiting the trusted subjects of BLP model, the network business security model can meet the access rules of network business between diffident security level.

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