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Technological advances in microelectronic and communication technology are increasingly leading to a highly connected environment equipped with sensors producing a continuous flow of context data. The steadily growing number of sensory context data available enables new application scenarios and drives new processing techniques. The growing pervasion of everyday life with social media and the possibility of interconnecting them with moving objects' traces, leads to a growing importance of access control for this kind of data since it concerns privacy issues. The challenge in twofold: First mechanisms to control data access and data usage must be established and second efficient and flexible processing of sensible data must be supported. In this paper we present a flexible and extensible security framework which provides mechanisms to enforce requirements for context data access and beyond that support safe processing of sensible context data according to predefined processing rules. In addition and in contrast to previous concepts, our security framework especially supports fine-grained control to contextual data.

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