这就要求从传统的静态安全模型转向动态模型，以跟上SOA体系结构中更快的变更速度。
This requires that you move from traditional, static security models to dynamic models that can keep up with the accelerated rate of change in an SOA architecture.
在安全信息系统应用中，传统的基于角色的访问控制模型不能为用户过滤业务数据，容易导致数据失密。
In the application of secure information systems, the traditional role-based access control model can not filter business data for users, which easily results in secret data leakage.
本文首先讨论了网络安全问题及其对策，包括网络安全的目的，网络现存的威胁，传统的网络安全技术和网络安全模型。
Firstly, in the paper I introduce network security problem and the method the network security aim at, network threaten, traditional network technology and the network security module.
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