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Smartphones are becoming ubiquitous and we use them for different types of tasks. One problem of using the same device for multiple tasks is that each task requires a different security model. To address this problem, we introduce Droid Mood Swing (DMS), an operating system component that applies different security policies to detected security modes automatically. DMS uses a context manager that tracks the context of the phone from the available sensors. DMS then determines the security mode from the contexts and can impose a number of security measures, namely fine-grained permissions, an intent firewall, a context-aware SD card filesystem, and a permission verification system. The permission verification system uses machine learning techniques to detect suspicious apps and anomalous permission requests. DMS also provides an API that enables third-party developers to make their apps …