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add additional considerations for fingerprint sensors

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@ -42,6 +42,12 @@ Ultrasonic fingerprint sensors use sound to create a detailed 3D representation
One downside is that you lose the protection against dead tissue that capacitive sensors offer, but this is not relevant for most people. One downside is that you lose the protection against dead tissue that capacitive sensors offer, but this is not relevant for most people.
### Additional Considerations
Fingerprint unlock will inherently be vulnerable to someone forcing you to put your finger on the sensor to unlock your device, so keep this in mind when threat modeling.
They also won't work with gloves and sometimes screen protectors can interfere, so make sure that the sensor is uncovered and making direct contact with your actual finger.
## Face Unlock ## Face Unlock
Many devices come with the capability to unlock them using your face. The implementations of this technology can vary wildly between manufacturers since a secure implementation requires a lot of special hardware, so many OEMs choose to cheap out. All forms of face unlock are more likely to allow a twin or sibling into your device since their face is more similar to yours than a random person off the street, so keep that in mind in your threat model. Many devices come with the capability to unlock them using your face. The implementations of this technology can vary wildly between manufacturers since a secure implementation requires a lot of special hardware, so many OEMs choose to cheap out. All forms of face unlock are more likely to allow a twin or sibling into your device since their face is more similar to yours than a random person off the street, so keep that in mind in your threat model.