An Extended Secure Data Model of Master-Slaver Structure Tables
一个改进的主从结构表安全数据模型

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.