False Acceptance Rate (FAR)
The probability that a biometric system incorrectly accepts an unauthorized individual as if they were an enrolled and authorized user.
For access control, a very low FAR is critical because unauthorized entry poses a higher security risk than rejecting legitimate users.
Frequently Asked Questions about False Acceptance Rate (FAR)
What is an acceptable FAR for access control?
For high-security zones (server rooms, labs), FAR should be below 0.01%. For general attendance, FAR up to 0.1% may be acceptable depending on risk tolerance.
Can FAR be adjusted?
Yes. FAR and FRR are linked by a sensitivity threshold — increasing security (lower FAR) increases rejections (higher FRR). Nialabs allows threshold tuning per zone.
Does anti-spoofing affect FAR?
Yes — strong anti-spoofing significantly reduces FAR by rejecting photo and mask attacks that could fool a biometric matcher without liveness checks.
