# Reasoning about Privacy Properties of Biometric Systems Architectures in the Presence of Information Leakage

## Abstract

Motivated by the need for precise definitions of privacy requirements, foundations for formal reasoning, and tools for justifying privacy-preserving design choices, a recent work introduces a formal model for the description of system architectures and the formal verification of their privacy properties. A subsequent work uses this framework to reason about privacy properties of biometric system architectures. In these studies, the description of an architecture specifies each component, their computations and the communications between them. This static approach makes it possible to reason about design choices at the very architectural level, leaving aside the implementation details. Although it is important to express privacy properties at this level, this approach fails to catch some leakage which may result from the system runtime. In particular, in the case of biometric systems, known attacks allow to recover some biometric information following a black-box approach, without breaking any part of the system. In this paper, we extend the existing formal model in order to deal with such side-channel attacks and we apply the extended model to analyse biometric information leakage in several variants of a biometric system architecture.

### Keywords

Formal methods Biometric systems Privacy by design## Notes

### Acknowledgements

This work has been partially funded by the French ANR-12-INSE-0013 project BIOPRIV and the European FP7-ICT-2013-1.5 project PRIPARE.

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