this post was submitted on 02 Nov 2023
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Android

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[–] [email protected] 18 points 1 year ago (8 children)

I am still a little unclear on what this means. Isn't the idea of passkeys that they're stored on your PC's TPM? What does Bitwarden "supporting passkeys" mean in that case? Are they not stored on the device if you use Bitwarden?

[–] [email protected] 16 points 1 year ago (1 children)

You're thinking about "device-bound passkeys". Bitwarden and any other third-party credential manager leverages "synced passkeys" because they don't control the hardware.

Synced passkeys are actually called out in the FIDO Alliance's FAQs as preferred since they more closely align with the desired replacement of traditional passwords.

[–] [email protected] 4 points 1 year ago (1 children)

So it's just one half of a key pair stored in Bitwarden, then? And you authenticate to Bitwarden as usual?

[–] [email protected] 2 points 1 year ago

Well, it's a full keypair being stored: Authenticators like Bitwarden need to first provide the public key to the relying party (RP) so the RP can issue the encrypted auth challenge. The challenge then is handed back to the authenticator, user verification happens, then the challenge is signed by the private key and sent back to the RP for verification to complete the auth ceremony.

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