document: Modeling privacy control in context-aware systems Significant complexity issues challenge designers of context-aware systems with privacy control . Information spaces provide a way to organize information , resources , and services around important privacy-relevant contextual factors . In this article , we describe a theoretical model for privacy control in context-aware systems based on a core abstraction of information spaces . We have previously focused on deriving socially based privacy objectives in pervasive computing environments . Building on Ravi Sandhu 's four-layer OM-AM -LRB- objectives , models , architectures , and mechanisms -RRB- idea , we aim to use information spaces to construct a model for privacy control that supports our socially based privacy objectives . We also discuss how we can introduce decentralization , a desirable property for many pervasive computing systems , into our information space model , using unified privacy tagging
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