What is False Acceptance Rate Type II?
False Acceptance Rate Type II Definition: This is erroneous recognition either by confusing one user with another, or by accepting an imposter as a legitimate user.
Understanding False Acceptance Rate Type II
This is erroneous recognition either by confusing one user with another, or by accepting an imposter as a legitimate user. In biometric and authentication systems, the False Acceptance Rate FAR is the probability that the system incorrectly authenticates an unauthorized user. It represents a security error where an impostor is wrongly accepted as a legitimate user. FAR is a key security metric addressed in standards like ISO IEC 19795 for biometric system evaluation. Organizations tune authentication systems by balancing FAR against False Rejection Rate FRR based on security requirements, with high-security applications prioritizing lower FAR. For example, a high-security facility biometric access control might be configured with a very low FAR 0.01 percent to minimize the chance of unauthorized access, while accepting a higher FRR as a tradeoff. Related terms: Biometric authentication, False Rejection Rate FRR, Crossover Error Rate CER, Authentication accuracy, Receiver Operating Characteristic ROC, Security-usability tradeoff.