The Privacy ZEBRA: Zero Evidence Biometric Recognition Assessment

Andreas Nautsch, Jose Patino, N. Tomashenko, Junichi Yamagishi, Paul-Gauthier Noé, Jean-François Bonastre, Massimiliano Todisco, Nicholas Evans

Mounting privacy legislation calls for the preservation of privacy in speech technology, though solutions are gravely lacking. While evaluation campaigns are long-proven tools to drive progress, the need to consider a privacy adversary implies that traditional approaches to evaluation must be adapted to the assessment of privacy and privacy preservation solutions. This paper presents the first step in this direction: metrics.

We introduce the zero evidence biometric recognition assessment (ZEBRA) framework and propose two new privacy metrics. They measure the average level of privacy preservation afforded by a given safeguard for a population and the worst-case privacy disclosure for an individual. The paper demonstrates their application to privacy preservation assessment within the scope of the VoicePrivacy challenge. While the ZEBRA framework is designed with speech applications in mind, it is a candidate for incorporation into biometric information protection standards and is readily extendable to the study of privacy in applications even beyond speech and biometrics.

 DOI: 10.21437/Interspeech.2020-1815

Cite as: Nautsch, A., Patino, J., Tomashenko, N., Yamagishi, J., Noé, P., Bonastre, J., Todisco, M., Evans, N. (2020) The Privacy ZEBRA: Zero Evidence Biometric Recognition Assessment. Proc. Interspeech 2020, 1698-1702, DOI: 10.21437/Interspeech.2020-1815.

  author={Andreas Nautsch and Jose Patino and N. Tomashenko and Junichi Yamagishi and Paul-Gauthier Noé and Jean-François Bonastre and Massimiliano Todisco and Nicholas Evans},
  title={{The Privacy ZEBRA: Zero Evidence Biometric Recognition Assessment}},
  booktitle={Proc. Interspeech 2020},