False rejection rate

The False Rejection Rate or FRR (also false rejection rate , rarely false rejection ratio ) is a concept of biometrics . He describes the frequency, are rejected by mistake with the people through a biometric system, although it is a privilege and an access authorization have.

A small FRR of e.g. B. 1/1000 says that out of 1000 authorized access attempts, only one is wrongly rejected on a statistical average. The biometric identification in question can thus be described as relatively reliable.

The false non-match rate (FNMR) is often used synonymously. In their calculation, however, access attempts that z. B. fail from the start due to poor image quality, not taken into account.

The FRR is a convenience feature. An erroneous rejection is just annoying, but not relevant to security.

In connection with this, the false acceptance rate (FAR) is always used as a security feature .