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Proceedings Paper

Analytical template protection performance and maximum key size given a Gaussian-modeled biometric source
Author(s): Emile J. C. Kelkboom; Jeroen Breebaart; Ileana Buhan; Raymond N. J. Veldhuis
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Paper Abstract

Template protection techniques are used within biometric systems in order to protect the stored biometric template against privacy and security threats. A great portion of template protection techniques are based on extracting a key from or binding a key to a biometric sample. The achieved protection depends on the size of the key and its closeness to being random. In the literature it can be observed that there is a large variation on the reported key lengths at similar classification performance of the same template protection system, even when based on the same biometric modality and database. In this work we determine the analytical relationship between the system performance and the theoretical maximum key size given a biometric source modeled by parallel Gaussian channels. We consider the case where the source capacity is evenly distributed across all channels and the channels are independent. We also determine the effect of the parameters such as the source capacity, the number of enrolment and verification samples, and the operating point selection on the maximum key size. We show that a trade-off exists between the privacy protection of the biometric system and its convenience for its users.

Paper Details

Date Published: 14 April 2010
PDF: 12 pages
Proc. SPIE 7667, Biometric Technology for Human Identification VII, 76670D (14 April 2010); doi: 10.1117/12.850240
Show Author Affiliations
Emile J. C. Kelkboom, Philips Research (Netherlands)
Jeroen Breebaart, Philips Research (Netherlands)
Ileana Buhan, Philips Research (Netherlands)
Raymond N. J. Veldhuis, Univ. Twente (Netherlands)

Published in SPIE Proceedings Vol. 7667:
Biometric Technology for Human Identification VII
B. V. K. Vijaya Kumar; Salil Prabhakar; Arun A. Ross, Editor(s)

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