Time will not tell: Temporal approaches for privacy-preserving trajectory publishing

Anna Brauer, Ville Mäkinen, Laura Ruotsalainen, Juha Oksanen

Abstract: Highlights•Accurate temporal information is a key enabler for privacy breaches in spatio-temporal trajectories.•Shifting trajectories in time prevents re-identification and attribute linkage in common attack scenarios.•Markov chain-based speed perturbation preserves dynamic patterns while obfuscating travel times and motion attributes.•Simulated re-identification attacks show favorable utility-to-privacy ratio of temporal privacy-preserving mechanisms.