Database Reference
In-Depth Information
14
Number of attributes = 3
Number of security levels = 4
12
10
8
6
4
2
0
0
0.25
0.5
Number of Tu ples
0.75
1
Millions
SeaView
MLR
Jajodia-Sandhu
Belief-Consistent
Smith-Winslett
MLS-Encryption
Figure 5.14 Impact of varying the number of tuples in an update query. (L. Pan. 2008. Proceedings
of International Symposium on Electronic Commerce and Security, 518-522.)
security models and the proposed encryption-based multilevel security
(MLS) model when executing the UPDATE query. The UPDATE
statement that is used in the following experiments is described as
follows:
Update Employee set salary = salary+100 where
department = 'Sales'
5.5 Analysis of Experimental Results
The performance of the Smith-Winslett model is the best because it
does not support the security classification at the level of each single
attribute; the access classes can be assigned only to key attributes and
to tuples as a whole. The MLR model offers less performance than the
Smith-Winslett model because it supports the security classification
at the level of each single attribute. The belief-consistent model has
less performance than the MLR model because it supports a combi-
nation of the security classification levels for each single attribute to
enable the user to assert his beliefs of lower level users' information.
 
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