不正アクセス許容率（FAR）は、生体認証において重要な指標です systems and security protocols that assesses the accuracy of authentication methods. It represents the probability that an unauthorized user is falsely identified as an authorized user by the system. This metric is particularly significant in applications such as 顔認識, fingerprint scanning, and other biometric identification techniques.
FAR is calculated by taking the number of false acceptances (instances where the system incorrectly grants access to an unauthorized user) and dividing it by the total number of identification attempts made 不正なユーザーによる
FAR = (誤認許容数) / (不正アクセス試行の総数)
FARが低いほど、より安全なシステムを示し、不正アクセスの可能性を最小限に抑えます。逆に、高いFARは認証プロセスの脆弱性を示し、セキュリティ侵害や敏感情報への不正アクセスにつながる可能性があります。
It is important to balance FAR with the False Rejection Rate (FRR), which measures the likelihood that an authorized user is incorrectly denied access. A system with low FAR but high FRR may 不正アクセスを防ぐ but also frustrate legitimate users. Therefore, when designing biometric systems, achieving an optimal balance between FAR and FRR is essential for usability and security.