No, since all isolated digits would have similar responses. The attack vector is not "is x your PIN?" but it's "is pattern xyzw meaningful to your brain whatsoever?"
My reading of the article is that if you show someone something that is significant to them, such as "Is the first digit of your PIN the number 1?", then it'll trigger a measurable response, and the first graph in the article is "1st digit PIN"
So I'm not sure where you're reading that it wouldn't work using the single digit approach.
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Couldn't you just do one digit at a time (is your first digit 1?, etc)? It would take less than a minute at 1 second per digit that way.
No, since all isolated digits would have similar responses. The attack vector is not "is x your PIN?" but it's "is pattern xyzw meaningful to your brain whatsoever?"
My reading of the article is that if you show someone something that is significant to them, such as "Is the first digit of your PIN the number 1?", then it'll trigger a measurable response, and the first graph in the article is "1st digit PIN"
So I'm not sure where you're reading that it wouldn't work using the single digit approach.