| 多级安全关系数据模型研究及其改进 |
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| 引用本文： | 王立松,丁秋林.多级安全关系数据模型研究及其改进[J].南京航空航天大学学报(英文版),2003,20(2):236-242. |
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| 作者姓名： | 王立松 丁秋林 |
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| 作者单位： | 南京航空航天大学信息科学与技术学院,南京,210016,中国 |
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| 基金项目： | 航空科学基金 ( 0 2 F5 2 0 3 3 )资助项目~~ |
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| 摘 要： | 讨论了基本的多级安全模型存在的主要缺陷，如推理通道问题。系统的可用性、灵活性受到严格的“向下读，向上写”规则的限制问题．不能保证数据完整性。通过引入多实例和伪元组．并重新定义读写规则．使改进后的模型更具安全性、灵活性和可用性。
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| 关 键 词： | 伪元组 多实例 数据完整性 数据模型 多级安全数据库 隐通道 |
STUDY AND IMPROVEMENT OF MLS RELATIONAL DATA MODEL |
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| WANG Li-song,DING Qiu-lin.STUDY AND IMPROVEMENT OF MLS RELATIONAL DATA MODEL[J].Transactions of Nanjing University of Aeronautics & Astronautics,2003,20(2):236-242. |
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| Authors: | WANG Li-song DING Qiu-lin |
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| Abstract: | The conception of multilevel security (MLS) is commonly used in the study of data model for secure database. But there are some limitations in the basic MLS model, such as inference channels. The availability and data integrity of the system are seriously constrained by it′s "No Read Up, No Write Down" property in the basic MLS model. In order to eliminate the covert channels, the polyinstantiation and the cover story are used in the new data model. The read and write rules have been redefined for improving the agility and usability of the system based on the MLS model. All the methods in the improved data model make the system more secure, agile and usable. |
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| Keywords: | data model multilevel secure database covert channels polyinstantiation cover story |
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