基于任务的访问控制模型是一种以任务为中心，并采用动态授权的主动安全模型。
Task based Access Control Model is task centered and offers dynamic authorization , so it belongs to the active security model.
基于任务的授权控制（TBAC）则是以任务为中心，并采用动态授权的主动安全模型。
Task based access control (TBAC) is an initiative security model, where task is focus of work and dynamic authorization is used.
文中研究并实现了一种主动网络下的安全传输模型。
Research and implement one kind of secure transmission model based on active network.
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