this post was submitted on 12 Oct 2026
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Privacy
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I don't like passkeys, but this is not a real worry, unless the service you are using is ran by idiots. I mean to say that knowing how passkeys are generated is typically not helpful in guessing your passkey. There are more interesting questions where security fumbles, like is your data encrypted on the provider side & is that encryption tied to your passkey or not, often not, since they want to mine your data.
You'd be surprised how poorly most modern web developers (especially LLMs) understand cryptography and the importance of protecting secrets, often storing them in plain text in poorly protected code repos, etc. On a site with a large enough user base and access to that information, it's absolutely possible to reduce the number of tries to hits to a manageable level for a distributed botnet that can't easily be blocked.
This is very hard for me to imagine. Even if the people running the website are incredibly incompetent, they would have to be intentionally moronic about passkey generation for what you are envisioning to be realistic. You are right that passkeys enable brute forcing on a scale regular passwords don't, but it doesn't matter, because normal passkeys are just too long for this to be a worry.
Have you ever used bank software, or some government services site? It is often really hard to not get the idea that it was designed and run by idiots. As someone who's worked as a software developer most of my life, it is not difficult for me to believe it, either.