关键词: 指纹识别, 模板保护, 可撤销, 比特串

Abstract:

In a fingerprint authentication system, the user's privacy and security would be threatened when attacker obtain user's fingerprint template, therefore, the fingerprint template protection has become a key link.Although many fingerprint template protection methods have been proposed, it is still a challenging task to devise a scheme which satisfies both diversity, revocable, irreversible and high-performance. This paper proposes a cancelable fingerprint template protection scheme which generates a revocable bit-string template from a set of minutiae points. The main idea is to choose a minutiae point as reference point,comparing with all other minutiae points to get relative distance and direction Angle, then, mapping the minutiae into a 2 dimensional polar grid which consist of small cells and finding out which cells include minutiae. Changing the user's password to generate new bit-string template when the bit-string template has been revealed. Because of the transformation process is irreversible, so the attacker can't restore the original fingerprint information by bit-string template.This method could protect the privacy of users. In the experiments,testing this method and S.Wang's method which has been presented by the FVC2004 DB1 and FVC2004 DB1 database, the experimental results showed that the proposed method is superior and higher security than S. Wang's method.

Key words: fingerprint authentication, template protection, cancelable, bit-string