Passkeys seem like mtls...so much so that I'm not sure what the difference is.
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MTLS is for transport layer security, not authentication security. This is closer to those RSA keys where there is an RSA server keeping track of all the fobs that can be queried to figure out what number they are currently showing. Acting as a something you have factor of authentication, proving you are who you say you are.
Can I get an explanation on what exactly passkeys are? I already use bitwarden for passwords, is there any good reason to switch to passkeys if that works for me?
Passkeys are a form of passwordless authentication. You store them in Bitwarden like regular passwords, but when you want to access a site that supports them (e.g. eBay) instead of asking for you password and autofilling or copy pasting it from Bitwarden your Bitwarden pops up and asks you if you want to login and it just happens (if you have multiple passkeys associated with a site you can select which you want to use). That's it. No password fields which get autofilled and no password in your clipboard (history).
Thanks for the explanation. From the sound of it I'll probably stick with passwords—i like being able to copy them, cause I'm often signing in to an application, not a website, etc.
Sounds a lot like SSO no?
It is a similar experience, but you don't need any infrastructure for it. Everything is handled by your device.
How do I create a passkey with Proton Pass then? I don't see that option when pressing the big Plus button.
If the site you're using supports passkeys, it should have an option in your account settings somewhere to create one. When you do, proton pass (or whatever other password manager) will prompt you to save that passkey. You can't manually create one in Proton pass, it has to be the website requesting to save one.
Oh I see! So essentially it's like creating a separate key pair for each login/site? Or will I be able to reuse the same public key/passkey for many different sites once it's created?