Abstract
A Hierarchical Bloom Filter (HBF) -based biometric framework was recently proposed to provide compact storage, noise tolerance, and fast query processing for resource-constrained environments, e.g., Internet of things (IoT). While security and privacy were also touted as features of the HBF, it was not thoroughly evaluated. Compared to the classical BFs, the HBF uses a threshold parameter to make robust authentication decisions when the HBF encounters noise in the biometric input which one would think might lead to security issues. In this paper, the attack vectors that could compromise the HBF security by increasing the false positive authentication of non-members and by leaking soft information about enrolled members are explored. With quantitative analyses, HBF-based biometric system security under these well-defined attack vectors is evaluated and it is concluded that the framework is more difficult to attack than the classical Bloom Filter. Further, experimental results show that soft biometric information is also kept private.
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