You generate another passkey is your answer. How do you do that? The exact same way you do today. Why would you need to delete invalid passkeys? You wouldn't.

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raron 2 days ago | parent [-]

> You generate another passkey is your answer. How do you do that? The exact same way you do today.

How can I do that, if Passkeys are the only option to log in?

If I can just use a password to log into a website without Passkeys, then Passkey is useless and doesn't add any security benefit.

> Why would you need to delete invalid passkeys? You wouldn't.

I sell my old (and no longer updated) phone or PC and don't want someone to get access to my account by getting access to the secret keys.

An non-revocable authentication mechanism is just stupid.

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winstonwinston 2 days ago | parent [-]

> How can I do that, if Passkeys are the only option to log in?

It is not feasible to remove password login or some other recovery login method.

> If I can just use a password to log into a website without Passkeys, then Passkey is useless and doesn't add any security benefit.

It isn’t useless, point is you don’t get to type in your password on a device that has passkey generated already, or get phished on a fake web address for example.

> I sell my old (and no longer updated) phone or PC and don't want someone to get access to my account by getting access to the secret keys.

Passkeys are meant to be protected by either PIN or biometrics, however they are also meant to be revocable on the web, at least they are for services i’ve been using with passkeys.

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raron 2 days ago | parent [-]

> It is not feasible to remove password login or some other recovery login method.

Then passkeys doesn't provide any real value if you have other less secure recovery option.

Let's say I have a bank account, going to the branch and doing an in person ID check is a valid recovery option, but nobody would want to do that just to log in from a new device.

> It isn’t useless, point is you don’t get to type in your password on a device that has passkey generated already, or get phished on a fake web address for example.

That's solved by letting the browser to remember the passwords.

> Passkeys are meant to be protected by either PIN or biometrics, however they are also meant to be revocable on the web, at least they are for services i’ve been using with passkeys.

PIN and biometrics doesn't have any inherent security. They rely on some hardware (or software separated from main system) feature, and even those can have vulnerabilities.

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winstonwinston 2 days ago | parent [-]

Using strong password as you suggested is a solved problem for your use case, but that is not universal. Passkeys provide universal security for all.

Also PIN or biometrics verification to access passkey from device bound TPM or security enclave solved the problem you implied might happen, such as losing your device. How do you protect your password manager, if any?

> even those can have vulnerabilities.

We shouldn’t just give up because everything is inherently insecure.

	▲	raron 2 days ago \| parent [-]
		> We shouldn’t just give up because everything is inherently insecure. True, but no sane way to mass revoke Passkeys from stolen / lost device is just bad design.