Towards Differential Privacy for Correlated Time Series

Aus SDQ-Institutsseminar
Vortragende(r) Viktoriia Trukhan
Vortragstyp Masterarbeit
Betreuer(in) Christine Tex
Termin Fr 13. Dezember 2019
Kurzfassung Differential privacy is the current standard framework in privacy-preserving data analysis. However, it presumes that data values are not correlated. Specifically, adversaries that are aware of data correlations can use this information to infer user’s sensitive information from differential private statistics. However, data correlations are frequent. In particular, values of time series like energy consumption measurements are frequently highly temporally correlated. In this thesis, we first introduce and critically review the notation of dependent differential privacy (DDP) introduced by Liu at. al (2016), which is a differential-privacy like privacy definition for spatially correlated data. Second, we adapt this notation and the respective privacy mechanisms to temporally correlated data. We evaluate our adaption on a real-world energy consumption time series showing that our mechanism outperforms the baseline approach. We conclude this work by stating in which direction the improvements of the mechanism might be done.