基于ITO玻璃的指纹膜识别方法

Fingerprint Film Recognition Method Based on ITO Glass

通过复制真实指纹纹路得到的指纹膜,可成功欺骗被广泛使用的光学指纹识别设备,给基于指纹验证的应用系统带来了巨大的安全隐患。基于指纹膜材料和真实手指导电能力的不同,通过检测真实手指或指纹膜触摸ITO玻璃时产生的微小电流变化,来实现对指纹膜与真实手指的区分,并基于单片机设计了指纹膜识别系统。经过自制的300余个指纹膜和真实手指的多次验证,本系统的识别率高于95%,可准确地区分出指纹膜和真实手指,提高了基于指纹检测的应用系统的安全性。

Fingerprint films can successfully deceive the widely used optical automatic fingerprint identification system（AFIS） by transferring the structure of real fingerprints,which brings severe security threaten to application systems based on AFIS.The conductivities of real finger and fingerprint film are different.A method is proposed to identify the real finger and fingerprint film by detecting the minor change in current which is produced by touching ITO glass.The new fake fingerprint detection system has been implemented based on MCU platform.After verifying about three hundreds fingerprint films and many real fingers,recognition rate of the system is above 95%.The new system can correctly distinguish the real finger and the fingerprint film,provide security enhancement for the application systems based on an fingerprint identification.