On the Leakage of Fuzzy Matchers

arXiv:2307.13717v4 Announce Type: replace
Abstract: In a biometric authentication or identification system, the matcher compares a stored and a fresh template to determine whether there is a match. This assessment is based on both a similarity score and a predefined threshold. For better compliance with privacy legislation, the matcher can be built upon a threshold-based obfuscated distance (i.e., Fuzzy Matcher). Beyond the binary output ("yes" or "no"), most algorithms perform more precise computations, e.g., the value of the distance. Such …

arxiv assessment authentication biometric can compliance cs.cr cs.cv identification legislation privacy privacy legislation score similarity system template threshold