I guess this would work... until the woman got pregnant.

From the thumbnail I thought her nipples had that 'streaking glowing red eye' effect.

we need this

NegativeSoul said:

I guess this would work... until the woman got pregnant.

Or they put on some weight that went to the breasts, or just get old and they start to get wrinkles or sag...

Even when using something that doesn't change much, like eyes, however, biometrics aren't common because they're actually not nearly as good as sci-fi movies make them out to be. (And they're routinely defeated in those movies, as well...) They can either be really strict, in which case even the slightest eye movement or blink when a laser is flashing in your eyes reads back a negative, or they're lax and give false positives, which defeats the purpose of the scanner.

NWSiaCB said:

Or they put on some weight that went to the breasts, or just get old and they start to get wrinkles or sag...

Even when using something that doesn't change much, like eyes, however, biometrics aren't common because they're actually not nearly as good as sci-fi movies make them out to be. (And they're routinely defeated in those movies, as well...) They can either be really strict, in which case even the slightest eye movement or blink when a laser is flashing in your eyes reads back a negative, or they're lax and give false positives, which defeats the purpose of the scanner.

NWSiaCB said:

Or they put on some weight that went to the breasts, or just get old and they start to get wrinkles or sag...

Even when using something that doesn't change much, like eyes, however, biometrics aren't common because they're actually not nearly as good as sci-fi movies make them out to be. (And they're routinely defeated in those movies, as well...) They can either be really strict, in which case even the slightest eye movement or blink when a laser is flashing in your eyes reads back a negative, or they're lax and give false positives, which defeats the purpose of the scanner.

What about DNA scanners? Yea, i know, not everyone wants to prick their finger all the time to open the door, but wouldn't that be more secure? I mean, other than some villian hacking off the main characters hand to use to break into the doors with.

Biometric identification should only used for "username" not "password". Further input for password should be done after the biometric scan for better security.

kamikazemonk said:

Biometric identification should only used for "username" not "password". Further input for password should be done after the biometric scan for better security.

"Something you know" (password), "something you have" (key/token/chip), and "something you are" (biometric). The more of these three things you can require, without being unnecessarily cumbersome to the user, the stronger your security. And indeed biometric authentication is one of the weakest links (because the ones we can actually implement are too "fuzzy" to get a decent false-negative rate without introducing too high a false-positive rate), and definitely needs to be augmented with at least one of the other two.