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Data Warehouses are used to maintain and manage the historical information. Data Warehouses contains the sensitive information such as financial records, customer's values etc. That information is considered to be very important and private. Therefore, it is necessary to secure the data from unauthorized accesses. Considering the importance of data security many data security models have been introduced in past years. Security models are used to implement data security from the early stages of Data Warehouse. These models are not suitable for existing Data Warehouses. Also, these models have...