针对信息系统存在的安全威胁，介绍了信息系统的安全层次模型，重点阐述了信息安全保密技术策略和网络安全技术策略，并给出了一个安全服务卡的简单功能说明和逻辑框图。%In this paper, contrapose the security menace of information system, we introduce the security arrangement model , expatiates on the technic policy of information security and secrecy and the technic policy of network security , we also fetch out a briefness function explanation and a logic diagram of a security serve card.
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