Security

Privacy Weaknesses in Biometric Sketches

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Executive Summary

The increasing use of biometrics has given rise to new privacy concerns. Biometric encryption systems have been proposed in order to alleviate such concerns: rather than comparing the biometric data directly, a key is derived from these data and subsequently knowledge of this key is proved. One specific application of biometric encryption is the use of biometric sketches: in this case biometric template data are protected with biometric encryption. The authors address the question whether one can undermine a user's privacy given access to biometrically encrypted documents, and more in particular, they examine if an attacker can determine whether two documents were encrypted using the same biometric.

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