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This thesis provides principles for security design of application systems with distributed databases, from both theoretical and practical aspects. First, general features of distributed databases, definitions and mechanisms of multi-level security, and implementation strategies were surveyed. The well-known commercial product, Sybase, was taken as an example to illustrate features of distributed databases and security mechanisms. Then, a security model for privilege management and responsibility assignment was presented. Prin-ciples for security design were outlined. Finally, an infor-mation system on budget management for Industrial Technology Research Institute (ITRI) was investigated to illustrate the applications of the principles.
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