Biometric Authentication
Biometric Authentication uses unique physical or behavioral characteristics — fingerprints, facial recognition, iris scans, or voice patterns — to verify a user's identity. It is a possession factor that is harder to compromise than knowledge factors because biometric data cannot be forgotten or easily guessed.
# WHAT TEAMS RUN INTO
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Biometric data is permanent — it cannot be rotated like a password. If biometric data is stolen and used to train an AI model, spoofing becomes possible forever.
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Biometric accuracy varies by environment. Fingerprint scanners fail when hands are wet or worn. Facial recognition fails in poor lighting or masks. False rejection rates increase in real-world conditions.
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Biometric collection raises privacy concerns. Organizations must store biometric templates securely, meet consent requirements, and handle regulatory scrutiny around biometric data.
# WHY IT MATTERS
Biometrics are the most human of authentication factors — you cannot delegate them, forget them, or share them easily. But biometric data is not a secret — everyone leaves fingerprints and faces wherever they go. Biometric authentication is strong only if the biometric template is protected as aggressively as a cryptographic key. Once biometric data is exposed, the user is compromised permanently.