Abstract
The article discusses the question of construction of the systems of protection against unauthorized access to information systems that are in commercial operation. It offers two concepts of development of the system from unauthorized access with minimal modifications in the already developed information system. As a means of building an effective system of protection in the process means of careful monitoring of access database DBMS Oracle (Fine Grained Access Control) are used. Depending on the size of the source database and the possibility to modify the table structure of the information system it is offered to use one or the other method for constructing a system of protection against unauthorized access. Developed protection system is relatively indepen- dent module that can be implemented in as needed.
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