A Bio-cryptosystem for Fingerprints Using Delaunay Neighbor Structures(DNS) and Fuzzy Commitment Scheme

The emergence of biometrics and it's widespread use in authentication applications made template protection in biometrics an important task to be considered in recent years. In this paper we propose a fingerprint bio-cryptosystem using fuzzy commitment scheme. We constructed Delaunay Neighbor Structures(DNS) from fingerprint minutiae points. Then a bit string representation of DNSs was developed. Bose, Chaudhuri, and Hocquenghem(BCH) error correction code is used along with bit string in the fuzzy commitment scheme to generate a secure template. During decoding phase, BCH decoding is performed to get the codeword. The EER obtained for proposed method on FVC 2002 DB1, DB2 and DB3 are 1.43%, 1.79%, and 5.89% respectively. This shows the credibility of the proposed method.