Comment Combine fingerprints with knowledge (Score 2) 328
If that's the case, then a possible solution would be an encryption that unlocks on one specific finger's fingerprint, but deletes all phone data for the other nine fingers. Since the ruling says you have to provide your fingerprints fine, but the knowledge of which finger's fingerprint is the correct one is knowledge in your brain, which doesn't have to be divulged. This would also, obviously, need to be combined with secure hardware that prevents the cops from simply copying the data and trying the fingerprints one at a time with the copy.
That way, you still have the convenience of a fingerprint unlock, but extra security against seisure, since the cops would only have a 10% chance of guessing the right finger.