The Instance-Based Multilevel Security Model - Multilevel Security for Relational Databases - page 159

Table 8.6 Comparative Study for Polyinstantiation Models

NULL
VALUE
INFERENCE

RESTRICTION
OF THE SCOPE
OF AN UPDATE

DISBELIEF
IN
A TUPLE

DATA
REDUNDANCY

PROBLEM SIMPLICITY

MODEL
SeaView Not solved Not solved Solved Not solved Very simple

Jajodia-Sandhu Solved Not solved Solved Not solved Simple

Smith-Winslett Solved Not solved Not solved Not solved Simple

MLR Solved Not solved Solved Not solved Complex

Belief-
consistent
multilevel
secure
relational data

Solved Not solved Solved Solved Very complex

IBMSM Solved Solved Solved Solved Simple

8.9 Summar y

The IBMSM data model is a simple, unambiguous, and powerful
model for supporting multilevel security databases. The advantage of
the IBMSM is that it eliminates null value inference and data redun-
dancy problems in other multilevel security database models. In this
chapter, we implemented the DML operations for the IBMSM.
We also explained the pseudocode and the flow charts for SELECT,
INSERT, UPDATE, and DELETE operations of the IBMSM. In
this chapter, we introduced a comparative study between the IBMSM
and other multilevel security database models to ensure that the
IBMSM solved most of the problems in the previous models. Also
in this chapter, we presented an overview of the multilevel relational
database security models and introduced the problems of each model.