Single-Component Privacy Guarantees in Helper Data Systems and Sparse Coding with Ambiguation
This addresses privacy concerns in biometric systems for users, but it is incremental as it focuses on an overlooked property rather than introducing a new paradigm.
The paper tackled the problem of privacy leakage about specific binary properties of individual components in biometric template protection systems, such as Helper Data Systems and Sparse Ternary Coding with Ambiguization, and found that both approaches can protect these sensitive variables with appropriate parameter settings.
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.