Anything used correctly is useful and so are UV,
disinfectant and biometrics.
Identification in physical space of personnel at
critical facilities could be a correct use of biometrics. Another correct use
is detection of suspicious guys who try to take over the logged-in device while
the user is away. Behavioral biometrics could help here; suspicious behavior
detected, the guy handling the device would be asked to feed a password for
fresh login.
If the biometrics used in cyber space are explicitly
declared to bring down security in return for increased convenience, it would
be a correct use case. On the other
hand, it is definitely wrong and unethical to declare that biometrics used with
a default/fallback password/PIN will increases security.
Mixing up the security-lowering 'multi-entrance'
deployment of two factors with the security-enhancing 'multi-layer' deployment
would bring a serious false sense of security that is worse than a lack of
security. Proponents of biometrics are
expected to behave as such.
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