I was looking at this question How is Fingerprint Authentication Secure?
Where it talks about biometric scans, and the answer by @Lie Ryan mentions this isn't a secure authentication method, but more for identity and such for those who are witnessing you actually using your biometrics to identify.
My question is, what if Biometrics were a series of scans, and not just one, kind of like a password? Instead of entering 1 letter for a password, we use a sequence. Would this be secure if we did this for authentication via biometrics?
For instance, what if our biometric password was pinky(L), ring(R), Middle(R), pointer(R), pointer(L), pinky(Toe Left), etc.
Would this actually provide to be secure? How much harder would it be to crack this type of biometric scan?
NOTE: There was mention in either the above question, or another question I read, that spoke about the merchant, or another party scanning and keeping your prints in their system.... I understand that is not good, but wouldn't the same be said if you entered a pin, or a password? wouldn't it be possible to steal that data as well? The issue is, they would need your device in order to access payments... right? Or would they be able to exploit something?
So again, my question is, how safe would a sequence of biometric scans be instead of a single scan? How good of an Authentication scheme would it be overall, compared to passwords?
Thanks all, happy new year.
EDIT: The answers so far both mention about the data not being able to be changed. My point is that with a sequence of biometric data you are giving a much harder time. If we consider each Biometric as an Alphanumeric, why couldn't a sequence work? If 123F is figured out to be your password, F123 is completely different, even though the metrics are the same (not saying F123 is secure, but you know what I mean).
Also, as mentioned above, if your metrics are stolen, just like a pin or password, you just change the sequence. if pinky pinky ring ring pointer pinky gets cracked we should be able to do ring pinky rping pinky, pinky pointer pointer ring, and it should be fine.
As pointed out below by @Julian, the scans these days can be tricky, which could affect the entire process, but it's possible that partials, or other data could help. Also, like entering a wrong password a few times, these things do happen, so with biometrics it is the same.