Using Humidity to Detect Human Presence

Sensor nodes are increasingly deployed in many environments. Most of these nodes feature onboard sensor chips to measure environmental data such as humidity, tem- perature and light. In this paper, we show that seemingly innocuous and non-sensitive data such as humidity measure- ments can disclose private information such as human pres- ence. We conduct several experiments using Telos motes running TinyOS to justify our claims. research to investigate mechanisms to prevent the leakage of private information.