Prior to 2003, the domestic database encryption means through the compilation of foreign security database system.

在2003年之前，国内的数据库加密手段是通过反编译国外安全数据库系统完成的。

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In this paper, we proposed a formal security database system access model including a multilevel relation model and a element-level authorization.

提出了一个安全数据库访问控制模型，包括一个多层关系模型和一个用以增强自主访问控制能力的元素级粒度的授权。

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The TCS requires control over the allocation and release of key system resources, including database records, communication sockets, security keys, etc.

TCS要求控制关键系统资源的分配和释放，包括数据库记录、通信套接字、安全密钥，等等。

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