| Summary: | 碩士 === 中華大學 === 資訊管理學系(所) === 98 === The development of Information technology and Internet is rapid in recent years. Many ubiquitous technology and applications are proposed to provide real-time computing and information service. People may use mobile devices to access resource at anytime and anywhere. It provides the convenience but also causes security problems such as theft, tampering, forgery by unauthorized personnel. This research proposed access control model for ubiquitous computing environment. The model combined the user, role, context attributes and context information to authorize the appropriate permissions to users. The study proposed a permission assignment algorithm for authorization management and to prevent unauthorized users.
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