We investigate the privacy of two approaches to (biometric) template protection: Helper Data Systems and Sparse Ternary Coding with Ambiguization. In particular, we focus on a privacy property that is often overlooked, namely how much leakage exists about one specific binary property of one component of the feature vector. This property is e.g. the sign or an indicator that a threshold is exceeded. We provide evidence that both approaches are able to protect such sensitive binary variables, and discuss how system parameters need to be set.
@article{arxiv.1907.06388,
title = {Single-Component Privacy Guarantees in Helper Data Systems and Sparse Coding with Ambiguation},
author = {Behrooz Razeghi and Taras Stanko and Boris Škorić and Slava Voloshynovskiy},
journal= {arXiv preprint arXiv:1907.06388},
year = {2019}
}