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As organizations increase their confidence on, information systems for daily business, possibly distributed, they become more vulnerable to security breaches even as they gain productivity and efficiency advantages. Although a number of techniques are encryption and electronic signatures. These techniques are currently available to protect data when transmitted across sites, a really comprehensive approach for data protection must also include mechanisms for enforcing access control policies based on data contents, characteristics and subject qualifications , and additional relevant contextual information, such as time. The semantics of data must be taken into account in order to specify effective access control policies. In addition, techniques for data integrity and availability specifically tailored to database systems must be adopted. Security models developed for databases, change in many aspects because they focus on different features of the database security problem or because they make different assumptions about what constitutes a secure database. This problem leads to disjointed and incomplete understanding of the organizational security strategy. It will make difficult to reconcile different security requirements. This thesis discusses the various security issues in databases and breaches. This approach is useful for the planning of explicit and directive based database security requirements
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