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this post was submitted on 20 Jul 2024
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main issue for me is that i didn't see any way to invalidate old passkeys. I tried them in a few websites like ebay but it looks like they are valid forever so if my device is compromised, the attacker has access to my account in perpetuity even if i change the password
You delete it from your account, that makes it invalid. Just like removing an entry from authorized_keys. If the site does this after changing the password or not is up to them.
I mean, suppose that i save a passkey in my password manager, then because of my bad opsec someone else gets hold of it - if I delete it from my account, the attacker still has a copy and I have no way to invalidate it
I checked again on eBay, there's no "list of passkeys" even if I created 4 of them (one for each browser on each of my computer + one synced via password manager)
eBay has implemented their passkey support poorly. “Turn off” will invalidate them. Most sites have a list of passkeys and you just delete the one you don’t want working anymore. At that point it doesn’t matter who has it, it’s useless.