Abstract
A database design methodology is presented in this paper which aims to improve the security of medical database systems. The proposed methodology is based on both the discretionary and the mandatory database security policies. In this way the advantages of both approaches are combined to enhance medical database security. The experimental implementation of the proposed methodology in a major Greek hospital is also presented. The implementation has shown that the combined discretionary and mandatory security enforcement effectively limits the unauthorised access to the medical database, without severely restricting the capabilities of the system.
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