Biometric Security: FaceID vs Fingerprint
Compare FaceID and fingerprint authentication methods to understand which biometric security option is best for protecting sensitive data.
Persay Team
Author
Biometric authentication has revolutionized how we secure our devices and data. But when it comes to protecting sensitive client information, which method is more secure: FaceID or fingerprint?
How Biometric Authentication Works
Both FaceID and fingerprint scanning convert unique physical characteristics into mathematical data:
Fingerprint Scanning
- Sensor captures the ridges and valleys of your fingerprint
- Creates a mathematical template (not an image)
- Template is encrypted and stored securely
- Future scans are compared against the template
FaceID Technology
- Projects 30,000+ infrared dots onto your face
- Creates a 3D depth map of facial features
- Machine learning analyzes the map
- Creates and stores an encrypted mathematical model
No Images Stored
Neither technology stores actual images of your fingerprint or face. They store mathematical representations that can’t be reverse-engineered into usable biometric data.
Security Comparison
False Acceptance Rate
The chance of a random person unlocking your device:
- Fingerprint (Touch ID): 1 in 50,000
- FaceID: 1 in 1,000,000
FaceID Advantages
- 20x lower false acceptance rate than fingerprint
- Works with masks (with training)
- Can't be fooled by photos
- Attention awareness prevents unlock while asleep
FaceID Limitations
- Identical twins may fool it
- Family members with similar features
- Requires good lighting conditions
- May struggle with some face coverings
Attack Vectors
Fingerprint vulnerabilities:
- Lifted prints from surfaces
- Fake fingers (sophisticated attacks)
- Coerced unlock (someone pressing your finger)
FaceID vulnerabilities:
- Identical twin access
- 3D printed masks (extremely sophisticated)
- Coerced unlock (holding phone to face)
Practical Considerations
Speed and Convenience
| Factor | Fingerprint | FaceID |
|---|---|---|
| Unlock speed | ~0.5 seconds | ~0.4 seconds |
| Works with wet hands | Often fails | Yes |
| Works with gloves | No | Yes |
| Works in the dark | Yes | Yes (infrared) |
| Works while asleep | Yes (security risk) | No (attention required) |
Accessibility
FaceID advantages for accessibility:
- Works for users with hand mobility issues
- No precise finger placement needed
- Seamless authentication experience
Fingerprint advantages:
- Works for users with facial differences
- Doesn’t require facing the device
- Can register multiple fingers
Best Practice
Modern devices allow both methods as backups. Enable both when possible for maximum convenience without sacrificing security.
For Business Use
When protecting client data, consider these factors:
Device Sharing
If multiple people need access to an app or device:
- Fingerprint: Can register multiple fingerprints
- FaceID: Limited to one primary face (alternate appearance available)
Audit Requirements
For compliance and audit trails:
- Both methods provide device-level authentication
- Neither creates logs of authentication attempts
- Use app-level logging for audit compliance
Environmental Factors
Consider your work environment:
- Construction/dirty work: FaceID better
- Medical/gloves: FaceID better
- Extreme cold: FaceID better
- Full face covering required: Fingerprint better
The Legal Perspective
An important consideration for business use:
Legal Note
In some jurisdictions, courts have ruled that police can compel biometric unlock (pressing your finger or holding phone to face) but cannot compel you to reveal a password. Consider this when protecting highly sensitive data.
Recommendations for Sensitive Data
- Use biometrics for convenience
- Require additional PIN/password for most sensitive functions
- Enable “require password after restart”
- Set short timeout for biometric authentication
Security Best Practices
- 1
Enable Both When Available
Use FaceID as primary with fingerprint backup, or vice versa, for maximum flexibility.
- 2
Use Strong Backup Passcodes
Your biometric is only as secure as your backup authentication method. Use 6+ digit PINs or alphanumeric passwords.
- 3
Enable Attention Awareness
For FaceID, ensure attention awareness is on so the device won't unlock unless you're actively looking at it.
- 4
Review Registered Biometrics
Periodically check what fingerprints or faces are registered on your device. Remove any you don't recognize.
- 5
Use App-Level Biometrics
For apps containing sensitive client data, enable app-specific biometric locks as an additional layer.
Which Should You Choose?
Choose FaceID if:
- Security is paramount (20x lower false acceptance)
- You work in environments with dirty/wet hands
- Accessibility is a concern
- You want attention-based unlock protection
Choose Fingerprint if:
- You often wear face coverings
- Multiple people need device access
- You prefer discrete authentication
- FaceID technology isn’t available
Conclusion
Both FaceID and fingerprint provide excellent security for most use cases. FaceID offers statistically better security with its 1 in 1,000,000 false acceptance rate, but fingerprint remains a strong option.
For protecting sensitive client data, the best approach combines:
- Biometric authentication for convenience
- Strong backup passcode for security
- App-level biometric locks for sensitive applications
- Understanding of legal implications in your jurisdiction
The most important factor isn’t which biometric you choose—it’s ensuring you use it consistently and combine it with other security best practices.