In chapter 4 , we give a new approach for inference risk evaluation , which uses the rough set theory in data mining technique to catch the possible inference channel in mls dbms . compared with other methods , the main advantages lie in that it does n ' t need the knowledge of sso ( system security officer ) and can use the current available data mining tools to monitor the database in time . 4 在總結已有的研究成果的基礎上,利用數(shù)據(jù)挖掘技術中粗糙集( roughset )理論提出了一種對推理風險進行分析的量化方法,優(yōu)點是不依賴于系統(tǒng)安全員的知識、能夠處理確定性的和非確定性的推理通道的,利用相應工具,能夠在數(shù)據(jù)庫運行期間對推理風險進行監(jiān)督。