Temporal Context Lie Detection and Generation

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In pervasive (ubiquitous) environments, context-aware agents are used to obtain, understand, and share local contexts with each other so that all resources in the environments could be integrated seamlessly. Context exchanging should be made privacy-conscious, which is generally controlled by users’ privacy preferences. Besides who has rights to get what true information about him, a user’s privacy preference could also designate who should be given obfuscated information. By obfuscation, people could present their private information in a coarser granularity, or simply in a falsified manner, depending on the specific situations. Nevertheless, obfuscation cannot be done randomly because by reasoning the receiver could know the information has been obfuscated. An obfuscated context can not only be inferred from its dependencies with other existing contexts, but could also be derived from its dependencies with the vanished ones. In this paper, we present a dynamic Bayesian network (DBN)-based method to reason about the obfuscated contexts in pervasive environments, where the impacts of the vanished historical contexts are properly evaluated. On the one hand, it can be used to detect obfuscations, and may further find the true information; on the other hand, it can help reasonably obfuscate information.