Dr. Pim T. Tuyls Profile

Dr. Pim T. Tuyls

at Koninklijke Philips NV

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Proceedings Article | 25 August 2004 Paper

Privacy-protected biometric templates: acoustic ear identification

Pim Tuyls, Evgeny Verbitskiy, Tanya Ignatenko, Daniel Schobben, Ton Akkermans

Proceedings Volume 5404, (2004) https://doi.org/10.1117/12.541882

KEYWORDS: Biometrics, Ear, Acoustics, Databases, Computer programming, System identification, Cryptography, Phase measurement, Data hiding, Binary data

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Unique Biometric Identifiers offer a very convenient way for human identification and authentication. In contrast to passwords they have hence the advantage that they can not be forgotten or lost. In order to set-up a biometric identification/authentication system, reference data have to be stored in a central database. As biometric identifiers are unique for a human being, the derived templates comprise unique, sensitive and therefore private information about a person. This is why many people are reluctant to accept a system based on biometric identification. Consequently, the stored templates have to be handled with care and protected against misuse [1, 2, 3, 4, 5, 6]. It is clear that techniques from cryptography can be used to achieve privacy. However, as biometric data are noisy, and cryptographic functions are by construction very sensitive to small changes in their input, and hence one can not apply those crypto techniques straightforwardly. In this paper we show the feasibility of the techniques developed in [5], [6] by applying them to experimental biometric data. As biometric identifier we have choosen the shape of the inner ear-canal, which is obtained by measuring the headphone-to-ear-canal Transfer Functions (HpTFs) which are known to be person dependent [7].

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