  The identity of a user is permanently lost if biometric data gets compromised
since the biometric information is irreplaceable and irrevocable. To revoke and
reissue a new template in place of the compromised biometric template, the idea
of cancelable biometrics has been introduced. The concept behind cancelable
biometric is to irreversibly transform the original biometric template and
perform the comparison in the protected domain. In this paper, a coprime
transformation scheme has been proposed to derive a protected fingerprint
template. The method divides the fingerprint region into a number of sectors
with respect to each minutiae point and identifies the nearest-neighbor
minutiae in each sector. Then, ridge features for all neighboring minutiae
points are computed and mapped onto co-prime positions of a random matrix to
generate the cancelable template. The proposed approach achieves an EER of
1.82, 1.39, 4.02 and 5.77 on DB1, DB2, DB3 and DB4 datasets of the FVC2002 and
an EER of 8.70, 7.95, 5.23 and 4.87 on DB1, DB2, DB3 and DB4 datasets of
FVC2004 databases, respectively. Experimental evaluations indicate that the
method outperforms in comparison to the current state-of-the-art. Moreover, it
has been confirmed from the security analysis that the proposed method fulfills
the desired characteristics of diversity, revocability, and non-invertibility
with a minor performance degradation caused by the transformation.
