What measures can be taken against forgery?
The possibility to copy is no problem in many applications, because of high cost, long processing time, or because registered users can control access themselves (fingerprint mobile phone, gun trigger safety). In high-security applications, extra measures have to be taken, to ensure that the authorized user’s real fingerprint is used. Here are a few examples: • Addition of extra biometric features including prints of additional fingers to increase forgery expense • Fake detection by checking material and structure of finger tissue • Liveness detection as protection against simple copies • measuring of levels of blood oxygen by determining the hemoglobin concentration based on the varying absorption of infrared light wavelengths. • testing the finger reaction to sensor stimuli • temperature measurements • skin resistance measures • pulse measures • blood flow measure • Limiting the size of analysis area The area of analysis is limited to a special part of the fingerprint, in order to en
