Comment Re:Passcode plus thumbprint (Score 1) 311
Problem there is false positives. I know I'm not the only one who periodically has to make multiple attempts at biometric unlocking because the reader decided my finger wasn't good enough today. I'd hate to put my finger on the sensor and instead of being taken to my PIN prompt (three cheers for multi-factor unlocking), my phone commits seppuku instead.
Now explicitly registering a separate "duress fingerprint" ahead of time is another story. That could be quite useful (and perhaps more plausibly deniable?) if you have a traveling companion or if you think you can maintain the presence of mind, in the stress of the moment, to use the duress finger instead.
I'd rather see it linked to a dummy profile, though, or at least have the option for a real fingerprint, a dummy fingerprint, and a break-glass-nuke-everything duress fingerprint.