How does a transition from verification to identification affect the FRR?
During identification the recognition biometric features are compared to all references. Obviously, in contrast to a verification, more than one similarity value (score) is generated. This fact complicates the decision, whether a biometric characteristicis to be accepted, or not. In particular, there are multiple ways to decide, if, e.g., several scores exceed a threshold. As a result, each decision procedure needs its own definition for a false rejection. Two examples are given: One must differentiate between applications which allow access to personal data after a successful identification (e.g., access to a personal bank account), and applications which grant general access not dependent on one’s identity (e.g., entrance to a room without a protocol of an identified person’s presence). In the first case an assignment of a biometric characteristic to a false identity may happen. This is called a false identification, characterized by the False Identification Rate FIR. Furthermore, it
