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I don't like passkeys

853 points · 819 comments · ethanhawksley

  1. drtz · · focus · HN ↗
    Passkeys do marginally improve security against MITM and phishing attacks, but they are primarily for protecting the lowest common denominator from themselves: people who re-use passwords and/or don't use a password manager.

    If you use multiple devices throughout the day, registering passkeys in all of these systems becomes a big headache with O(m*n) complexity, so putting the passkeys in a password manager is the only realistic solution. But this still breaks the login flow for a very common use case: how do I log in on a device that I don't own? With a password in a password manager I at least have the option of manually typing the password.

    The biggest problem, though, is how users are pushed into it without any warning or knowledge of what they're signing up for. I've accidentally set up passkeys just by clicking an okay button a few times in the past and had to go back and figure out how to undo it after being blocked from login on another computer (which computer was I on again?).

    1. judge2020 · · focus · HN ↗
      > how do I log in on a device that I don't own?

      This is solved by passkey-implementing software and devices (with Bluetooth) allowing you to log in with a QR code (Webauthn via CTAP hybrid transport). iOS and Android support this, and it’s generally not a locked-down thing if other devices wanted to do it too.

      The only use case left is in “how do I login if all my devices are stolen/fall into a body of water” in which there really isn’t an answer beyond “get (a|your) device back, sign back into your password manager, use that to get back into critical accounts”.

      1. basch · · focus · HN ↗
        What if my phone is dead? Stolen?

        In the same vein as 2fa, going up to a fresh computer and trying to log into anything is now a nightmare. Every service has a 2fa that somehow loops into another provider that also has 2fa.

        And some 2fa, if not many, make accounts weaker. Apple's solution to get around 2fa is to put in SOMEBODY ELSES phone number that I trust, as a backdoor. It's an insane solution. And its normalized, and nobody questions it.

        1. Terr_ · · focus · HN ↗
          While we're at it, the insanity of those "recovery questions", made even worse when many companies demand the same ones.
          1. basch · · focus · HN ↗
            but you can type anything in the recovery box.

            its just three additional passwords.

            should you type the same brother name in each time? should you even answer with a name?

            don't get me wrong, they were insane, but they can be repurposed.

            1. samspot · · focus · HN ↗
              Good luck remembering what you put there when asked 10 years later.
              1. Terr_ · · focus · HN ↗
                Yeah, many do not even allow you to enter in a custom question, which would be marginally better--at least for users who care about security.

                Then you'd have the option to craft a question which is (A) personally memorable (B) specifically phrased to avoid ambiguity, (C) not public or guessable, and (D) unique to a service.

                * "Where is your first pet buried?"

                * "While on vacation, The Noodle Incident happened in which city?"

                * In what year did you first see Example Band live in concert along with Alice and Bob?"

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