Long-Term Privacy Profiling Through Smartphone Sensors

Smartphones are closely coupled with their users and smartphone sensors can perceive users' private information. The existing studies in this area focus on user activity recognition and short- term context detection. In this paper, we show that smartphone sensors are able to profile users' long-term privacy and more sensitive information. We present the techniques of discovering users' spending level by merely using smartphone sensors. We do not access users' contacts, calendar, or call log, so that the profiling is performed in a non-intrusive manner. This paper is an alert towards the public that the privacy leakage could be far worse than imagination by just carrying smartphones.