This thesis focuses on security problems of group communication, and intends to construct a policy-based security management infrastructure for group communication.

本文主要研究组通信的安全管理问题，目标是建立一个基于策略的组通信安全管理基础结构。

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Policy description language, which is one of the core parts of the policy-based security management system, is still lack of a common standard.

作为基于策略安全管理系统核心之一的安全策略描述语言，至今没有一种业界通用的标准。

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This is a key buying criterion for customers of hosted security suites who are looking for better visibility and policy management across their network through a Web-based portal.

FORBES: Microsoft Heats Up Security