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this post was submitted on 20 Jul 2024
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I really like them as a more secure way of logging in, its basically what authentication should have been all along (and weve been doing it all along, with SSH keys!). Its about time we take that private/public key concept and apply it to user accounts
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.