Message filter algorithms can implement mandatory access control in the multilevel secure systems with an object oriented model.
采用消息过滤算法可以在支持对象模型的多级安全系统中实现强制访问控制。
Labels are the foundation for implementing multilevel systems and the prerequisite of enforcing mandatory access control in secure systems.
标记是实现多级安全系统的基础，实施强制访问控制的前提。
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