摘要
到目前为止,大量的文献已经提出了许多用以实现多级安全数据库系统的安全模型,不同的模型有不同的优点。本文针对原有主从结构表安全模型容易产生语义模糊性和操作不完备性等问题,提出了一个能够消除语义模糊性和操作不完备性的新的主从结构表模型。该模型增加了基元组和数据继承的概念,重新定义了多实例完整性和参照完整性,将PUPDATE操作和数据继承完整性引入该模型,大大增强了系统的安全性和非二义性。
By far, a secure model to realize multilevel secure database system has been mentioned in large quantities of papers and different models have different advantages. In consideration of semantic ambiguity and operational incompleteness caused by secure model of original master-slaver structure tables, a new secure model is presented to eliminate the problem mentioned above. In this model, the new conception of base tuple and data-inherit are added, polyinstantiation integrity and referential integrity are redefined, and PUPDATE operation and data-inheret integrity are introduced, which strengthen the security and unambiguous of system largely.
出处
《计算机科学》
CSCD
北大核心
2006年第8期162-165,共4页
Computer Science
基金
973计划:"海量信息系统规律
模型和维护机理研究"子课题:海量信息系统知识与管理研究
编号:G1999032701
关键词
数据模型
多级安全
多实例
数据完整性
数据语义
Data model, Multilevel security, Polyinstantiation, Data integrity, Data semantic
