Mustapha Machkour

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The database systems use the mechanisms of granting and revoking privileges and of authorization control to ensure the security of data. However, some users such as administrators or persons in charge of security have access to comprehensive content of database including patient's information that are of intimate nature and must be discreet. To enhance the(More)
In this paper, we propose an efficient digital watermarking scheme to strengthen the security level already present in the database management system and to avoid illegal access to comprehensive content of database including patient's information. Doctors diagnose medical images by seeing Region of Interest (ROI). A ROI of a medical image is an area(More)
Extracting information from a database system becomes a primary obligation. More and more we are forced to recognize the importance of providing easy access to information stored in a database system. However existing tools that allow users to query database using database query languages such as SQL (Structured Query Language) are difficult for non-experts(More)
In the modern health service, data are stored in a Data Center and it can be accessed only by authorized users. However, this Data are prone to be exposed to a number of attacks, especially by the Cloud provider's Personnel with privileged access. To avoid illegal access to comprehensive content of data center including patient's information, we propose in(More)
Secure and efficient management of multimedia objects in medical information system have become a necessity in today's global environment. To strengthen the security level already present in the database management system and to avoid illegal access to comprehensive content of database including patient's information, we propose in this article a mechanism(More)
— In the medical field, images are increasingly used to facilitate diagnosis of diseases. These images are stored in multimedia databases accompanied by doctor's prescriptions and other information related to patients. Search for medical images has become for clinical applications an essential tool to bring effective aid in diagnosis. Content Based Image(More)
XML is widely used for data exchange between systems and applications. XML data are described in hierarchical form using XML schema languages such as XML DTD (Document Type Definition), W3C XML Schema or XDR (XML Data Reduced). To make these data accessible to relational database systems, which represent a dominant and efficient tool for storing and(More)
Making information stored in database accessible for non expert users, has become one of the problems of great interest for the research community of database querying system. Hence for overriding the complexity of using database language such as Structured Query Language (SQL), the using of natural language can be a very important and simple method. But(More)
XML is a standard for data exchanging between sites and heterogeneous applications. To exploit these data by database systems based on relational model, algorithms and methods of conversion have been developed. To do same with object-relational systems representing an extension of relational systems we propose in this paper a methodology to convert a XML(More)
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