Improvement of Fuzzy Vault for Multiple Fingerprints with Angles

In this paper we analyse an enhanced fuzzy vault scheme for fingerprints with minutia angles that claims to be correlation resistant. During our analysis of this scheme we found a new attack concerning the integration of chaff points with angles, termed angle-correlation attack, which is presented. Therefore, we introduce an improved fuzzy vault scheme for multiple fingers, which is resistant against "traditional" correlation attacks. We broadly analyse our scheme concerning usual attacks (brute-force, "traditional" correlation attacks and in addition angle-correlation attacks). We show that angle-correlation attacks are more or less negligible for our fuzzy vault approach for multiple fingers with minutiae angles.