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No Google, Adding Biometrics is the Opposite of Security and Privacy (infosec.pub)
submitted 3 months ago by to c/cybersecurity@sh.itjust.works
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[–] 2 points 3 months ago (12 children)

Definitely not. The average thief can get you to unlock it with your face or finger far easier than get your PIN.

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  • [–] 6 points 3 months ago (2 children)

    If you point a weapon at me in a way that would compel me to help you unlock my phone with fingerprint or face unlock, I promise you it would not be any harder for you to get me to unlock the device with the pin.

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  • [–] 3 points 3 months ago (1 child)

    You assume that you are conscious, or even alive in your scenario.

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  • [–] 3 points 3 months ago

    If I'm not alive I don't really care if they get the contents of my phone. My survivors can go through the same process I would for reversing a fraudulent transaction.

    And you're picturing a criminal subduing me and then just crouching over my body and figuring out what financial apps I have and how to use them?
    What's their game plan here? Most stolen phones are resold, not used to access their contents.

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  • [–] 2 points 3 months ago* (last edited 3 months ago) (8 children)

    Doubtful. The average thief isn't robbing you at gunpoint. They grab the phone out of your hand and book it.

    But even if they did stick around for that, most people use a 4 number pin and that's basically just as easy as face or fingerprint unlock. Its an additional maybe 2 seconds.

    If they can force you to put your finger on the sensor they can force you to give them the pin.

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  • [–] 3 points 3 months ago (7 children)

    Do any phones even allow 4 digit Pins? Apple doesn't, and my Samsung doesn't.

    No one can force you to give up the PIN. They can threaten, and you may give in to that threat. But that isn't forcing, that isn't against your will.

    But, a criminal can get you to unlock your phone with biometrics against your will easily enough - brute strength, render you unconscious, or even dead.

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  • [–] 2 points 3 months ago (5 children)

    No one can force you to give up the PIN. They can threaten, and you may give in to that threat. But that isn't forcing, that isn't against your will.

    That's called force, and against your will.

    That's just fundamentally not understanding how the terms work. A coerced action, or one taken under duress, is not taken of ones own free will.

    https://www.law.cornell.edu/wex/duress

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  • [–] 1 point 3 months ago (4 children)

    My comment was in reply to another saying a bad guy can force you to put your finger on the unlock sensor. There is no equivalent for pins.

    They can threaten, yes, and you can give into that threat. Yes, that would be against your will, but it still requires you to acquiesce or cooperate was my point. The can't get the pin without you giving it.

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  • [–] 2 points 3 months ago (3 children)

    Yeah, and if you're being robbed they'll probably fuck you up pretty badly if you don't. While not mind readers, they don't have to be.

    In most cases anyone who wants to beat your pin will just watch you unlock your phone. They don't need to see the exact numbers: you can pick most of it up just based on relative finger motion. Looking at screen smudges gives another set of hints that are pretty trivial to extract.

    If your goal is to keep it from the police, your best bet is to use an entirely different system than rely on your phones lock screen.

    I can't think of a scenario where I'm thinking both "biometrics are insufficient to safeguard this data" and "it's appropriate to keep this data on my telephone".

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  • [–] 1 point 3 months ago (2 children)

    You aren't wrong, but this discussion is mostly about edge cases. The average person, yea, they won't have anything that is end of their world if a bad guy accesses it. But, that does mean there aren't many phones that contain significantly more important data than you have.

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  • [–] 2 points 3 months ago (1 child)

    Given we're in a thread about biometrics being the opposite of privacy and security, it really does seem relevant to me that the threat model where they would be insufficient and the one where that would matter is basically empty.

    If your thought process is "I need to protect this from the police and a determined or sophisticated criminal, but I can't be bothered to use anything more than my lock screen on my phone"... Well, you're already starting from a pretty bad place.

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