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this post was submitted on 09 Apr 2024
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No, sharing passkeys across services is way too risky. One service gets compromised, someone gets your passkey, and then they have access to all of your services. It's the same principle with regular passwords.
Uh, each service only has access to your public key, not the private one that stays with you. It's less risky than a regular password.
Even with U2F hardware keys where the server-side stores the encrypted key (to allow for infinite sites to be used with a single hardware key), it's only decryptable on your key and thus isn't that useful for someone who has compromised a service.
Thanks. I'm still learning about this "new" technology (which already is, what, eight years?)
It started with U2F which may be older?