【摘要】 讨论了消息安全等级与容纳它的信息实体的安全等级的关系,提出了具有安全等级分辨和消息控制机构的信源模型,并给出了多级消息的流动控制政策和多种双向流动模式。更多还原

【Abstract】 The relation between the secure levels of messages and the information entity in which the messages is contained is discussed in the paper. The source model that contains macha-nism capable of distinguishing secure level and capable of flow controll is suggested. Also the flow controll policies for the multilevel messages and several types of bidirectional flow are given.更多还原