摘要
A multilevel secure relation hierarchical data model for multilevel secure database is extended from the relation hierarchical data model in single level environment in this paper. Based on the model, an upper lower layer relationalintegrity is presented after we analyze and eliminate the covert channels caused by the database integrity.Two SQL statements are extended to process polyinstantiation in the multilevel secure environment.The system based on the multilevel secure relation hierarchical data model is capable of integratively storing and manipulating complicated objects ( e.g. , multilevel spatial data) and conventional data ( e.g. , integer, real number and character string) in multilevel secure database.
A multilevel secure relation hierarchical data model for multilevel secure database is extended from the relation hierarchical data model in single level environment in this paper. Based on the model, an upper lower layer relationalintegrity is presented after we analyze and eliminate the covert channels caused by the database integrity.Two SQL statements are extended to process polyinstantiation in the multilevel secure environment.The system based on the multilevel secure relation hierarchical data model is capable of integratively storing and manipulating complicated objects ( e.g. , multilevel spatial data) and conventional data ( e.g. , integer, real number and character string) in multilevel secure database.
基金
86 3NationalHigh TechnologyandDevelopmentProgram!(No.86 3 30 1 0 6 0 5 B)
DepartmentofDefenceFoundation"TheTechnologyof
关键词
DATABASES
data
structure
data
models
secure
DBMS
covert
channels
mandatory
access
control
POLYINSTANTIATION
hierarchical
classification
non
hierarchical
category
security
level
integrity
cluster
index
databases, data structure, data models, secure DBMS, covert channels, mandatory access control, polyinstantiation, hierarchical classification, non hierarchical category, security level, integrity, cluster index
