Abstract: This paper elaborates a way of thinking about covert channel analysis in Oracle from the concept of covert channel, discusses contents and levels of covert channel analysis, the mark method of covert channel, the calculation and measurement of covert channel band width and the processing of covert channel, which provides a new way of improving Oracle 9i’s security performance.

Key words: Database security, B2 level security, Covert channel mark, Covert channel processing

摘要： 从隐蔽通道概念入手，阐述了隐蔽通道分析在Oracle中的设计思想，讨论了隐蔽通道分析的内容与层次、隐蔽通道的标识方法、隐蔽通道带宽的计算与测量、隐蔽通道的处理，就如何提高Oracle 9i安全性能提供了一种途径。

关键词: 数据库安全, B2级安全, 隐蔽通道标识, 隐蔽通道处理