الفهرس 
Motivation
Literature Review on Database WatermarkingOnly 14 pages are availabe for public view
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Abstract
This thesis provides a set of techniques that can preserve large Data sets.
These techniques deal with large data set independent on where data is stored, also can prove
copyright, ownership, and integrity. Data can be stored on entire database engines inside a
given business borders or even in a data ser- vice over the cloud. This thesis introduce namely
(1)Watermarking Rational Database with Non Repudiation (WRDN) ,(2)Enhanced Watermarking Tech- nique
for Rational Database with non-repudiation (EWRDN), (3)Enhanced Watermarking Approach for Secure
Database Service.
WRDN protect the ownership of relational database by adding only one hidden column. The calculation
of this formula is based on the values of other numeric and textual columns. Moreover, it traces
the updated data made by each users. It survives by 100% against insertion and deletion attacks.
At the same time, it fails in case of alternation attacks. So, some changes needed to be made in
order to save data over traditional DBMS engine and Cloud environment. EWRDN is based on a set of
enhancements for the WRDN approach. It improves space complexity by 56% of original WRDN system
with the same time complexity. Moreover, EWRDN as a differentiated quality service has been proven
to provide two different data compression qualities. It has been proven that the arithmetic
encoding has a fixed recovery ratio equal to one. At the same time, the transform encoding saves
space and consumed less time to recover data. EWRDN service works as a trusted third party
between clients and service providers. It guarantees data integrity and non repudiation. It
recovers data to its origin in case of errors or unauthorized changes happened. Moreover, it
gives data owner more controlling capabilities for their data, by tracing user’s activities.
Security for data exchange and Trust between the service providers and clients re very important
concerns in cloud environments. EWRDN service provides data security means as integrity, secrecy,
non repudiation and pri- vacy using data watermarking and compression techniques. As a service, it
consider exchanging data through many could services. Moreover, it gives
the users the ability to recover data, if suspected changes happened using a Digital Signature
Standard (DSS). It is proposed to be a part of the Service Oriented Architecture (SOA) of a Trusted
Third Party (TTP). Until now and to the best of our knowledge, EWRDN service is not realized in a
real cloud environment. A real implementation for EWRDN Service inside a TTP SOA is elaborated. The
results have shown that, the proposed service coordina- tion can provide protection against all of
the experienced database security threats. Nevertheless, other performance issues like the
required time and space of handling data have been analyzed showing a high achieved perfor- mance
of the proposed service.