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for all models as the number of tuples is increased. Also, supporting
encryption in the encryption-based multilevel database model
improves the performance of a multilevel database because the data-
base size is decreased due to removing the extra attributes used for
the class levels.
5.4.3.2 Impact of Varying the Number of Attributes The number of attri-
butes in each table is varied from two to three, four, five, and six.
Fix  the number of tuples at 1,000,000; fix the number of security
levels at four. From Figure 5.12 the response times grow for all models
as the number of attributes is increased. Also, supporting encryp-
tion in the encryption-based multilevel database model improves
the performance of a multilevel database because the database size is
decreased due to removing the extra attributes used for the class levels.
5.4.3.3 Impact of Varying the Number of Security Levels he number of
security levels is varied from two to three, four, five, and six. Fix the
number of tuples at 1,000,000; fix the number of attributes at  four.
50
Number of tuples = million
Number of security levels = 4
45
40
35
30
25
20
15
10
5
0
2
3
4
Number of Attributes
5
6
SeaView
MLR
Jajodia-Sandhu
Belief-Consistent
Smith-Winslett
MLS-Encryption
Figure 5.12 Impact of changing the number of attributes in a join query. (L. Pan. 2008.
Proceedings of International Symposium on Electronic Commerce and Security, 518-522.)
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