this post was submitted on 30 Mar 2024
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Passkeys seem like mtls...so much so that I'm not sure what the difference is.
There is a difference but right now as long as one uses a good password with a 2FA it is probably good enough. Too many services with passkeys are still quickly offering password resets via e-mail or text, so they, as sites, are not secure. And unless you can move your passkeys with you, like you can with passwords, you don't want to get locked into a single device or OS.
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.
MTLS is also used for authentication security in some cases.