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I'm not sure sure if you are talking passwords or biometrics, etc.
For passwordless options, duplication is only one problem. Once a biometric, for example, is duplicated, then it compromised and can't ever be secure again. It will be insecure whether either physically compromised or numerically compromised.
There are only a limited number of biometric options.
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[–] El_Syd ago
The trick is to make it complex enough to take a long time to circumvent and change it before that time.
[–] sohelpmehannah ago
I'm not sure sure if you are talking passwords or biometrics, etc.
For passwordless options, duplication is only one problem. Once a biometric, for example, is duplicated, then it compromised and can't ever be secure again. It will be insecure whether either physically compromised or numerically compromised.
There are only a limited number of biometric options.