Abstract
A CA-UCON (Context-Aware Usage CONtrol) model is an extension of the traditional UCON (Usage CONtrol) model which enables adaptation to environmental changes in the aim of preserving continuity of access. When the authorisations and obligations requirements are met by the subject and the object, and the conditions requirements fail due to changes in the environment or the system context, CA-UCON model triggers specific actions to adapt to the new situation. Besides the data protection, CA-UCON model also enhances the quality of services, striving to keep explicit interactions with the user at a minimum. In this paper, we propose an architecture of the reference monitor for the CA-UCON model and investigate a variety of enforcement approaches in ubiquitous computing systems; whether centralised, distributed or hybrid; depending on applications.
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