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Hashing technology gains much attention in protecting the biometric templatelately. For instance, Index-of-Max (IoM), a recent reported hashing technique,is a ranking-based locality sensitive hashing technique, which illustrates thefeasibility to protect the ordered and fixed-length biometric template.However, biometric templates are not always in the form of ordered andfixed-length, rather it may be an unordered and variable size point set e.g.fingerprint minutiae, which restricts the usage of the traditional hashingtechnology. In this paper, we proposed a generalized version of IoM hashingnamely gIoM, and therefore the unordered and variable size biometric templatecan be used. We demonstrate a realization using a well-known variable sizefeature vector, fingerprint Minutia Cylinder-Code (MCC). The gIoM transformsMCC into index domain to form indexing-based feature representation.Consequently, the inversion of MCC from the transformed representation iscomputational infeasible, thus to achieve non-invertibility while theperformance is preserved. Public fingerprint databases FVC2002 and FVC2004 areemployed for experiment as benchmark to demonstrate a fair comparison withother methods. Moreover, the security and privacy analysis suggest that gIoMmeets the criteria of template protection: non-invertibility, revocability, andnon-linkability.

A Generalized Approach for Cancellable Template and Its Realization for Minutia Cylinder-Code