[xanipher]

If you collect the data, some of it will be exposed, that's a very real risk. Especially in cases like this with biometrical data that can't be changed. I wonder if something will change after a few big leaks in this sector.

[olodus]

Yeah, having a immutable input key has always seemed real scary to me. Text/numbers has always seemed the best to me but if you really want something quicker and more natural for humans to do than writing, why not go for something like a pose or hand gesture. That can be easily changed, though I am not sure how many different versions there are of it. Spell out something in sign language?

[mannykannot]

Past experience strongly suggests that nothing will be learned from it.