Recently, biometric template protection has received much attention from the research community due to the security and privacy concerns of biometric template. Although a number of biometric template protection methods have been reported, yet, it is still a challenging task to devise a biometric template protection method which satisfies all the biometric template protection criteria namely diversity, revocability, non-invertibility and performance. In this paper, a method is proposed to generate a revocable fingerprint template of bit-string from a set of minutiae points through polar grid based 3-tuple quantization (PGTQ) technique. Two merits of the proposed method are outlined, i.e., alignment-free and performance. FVC2002 DB1 and DB2 are used to evaluate the performance of the proposed method. Besides, the template protection criteria are also examined to ensure the security and privacy of the biometric template.
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