Kalεido: Real-Time Privacy Control for Eye-Tracking Systems

Recent advances in sensing and computing technologies have led to the rise of eye-tracking platforms. Ranging from mobiles to high-end mixed reality headsets, a wide spectrum of interactive systems now employs eye-tracking. However, eye gaze data is a rich source of sensitive information that can reveal an individual's physiological and psychological traits. Prior approaches to protecting eye-tracking data suffer from two major drawbacks: they are either incompatible with the current eye-tracking ecosystem or provide no formal privacy guarantee. In this paper, we propose Kaleido, an eyetracking data processing system that (1) provides a formal privacy guarantee, (2) integrates seamlessly with existing eyetracking ecosystems, and (3) operates in real-time. Kaleido acts as an intermediary protection layer in the software stack of eye-tracking systems. We conduct a comprehensive user study and trace-based analysis to evaluate Kaleido. Our user study shows that the users enjoy a satisfactory level of utility from Kaleido. Additionally, we present empirical evidence of Kaleido's effectiveness in thwarting real-world attacks on eye-tracking data.