Database Reference
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his topic will introduce the concept of multilevel security in the
relational database, will present a comparative study for previous
models that support multilevel security policies in the relational data-
base, and will show the weakness and the strength of each model.
Also, in this topic a prototype will be implemented to be used as
a research tool for a performance evaluation of multilevel security for
relational database (MLS/DBMS) models.
his topic will give a complete view of an encryption-based mul-
tilevel security database model, which is a combination of multilevel
security for the relational database and encryption system by encrypt-
ing each record with an encryption key according to its security class
level. This model is characterized by three achievements:
• Utilizing an encryption system as a second security layer over
the multilevel security layer for the database
• Reducing the multilevel database size
• Improving the response time of data retrieval from the mul-
tilevel database
The goal of these three achievements is to increase robustness
against database attacks and enhance the performance of data manip-
ulating operations such as select, insert, update, and delete in the mul-
tilevel database. The effectiveness of an encryption-based multilevel
security database model is verified through the mathematical proof of
the soundness of, completeness of, and security for multilevel security
for relational database system.
The encryption-based multilevel security database model achieves
good quality because it satisfies integrity properties such as entity
integrity, polyinstantiation integrity, data borrowing integrity,
foreign key integrity, and referential integrity of the multilevel data-
base. Also, this topic will illustrate the C# and Microsoft SQL server
source codes for the implementation of the encryption-based multi-
level security database model.
Concurrency control is used in relational databases to manage the
concurrent execution of operations by different subjects on the same
data object. his topic will explain the concept of concurrency con-
trol and will define its impacts on multilevel security for relational
databases. It will create a survey for studying the secure concurrency
control protocols that are proposed in multilevel security for relational
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