![]() The PRF symmetric key is used to decrypt your PRF-encrypted private key, resulting in your PRF private key. Using the same salt provided by Bitwarden and the internal secret unique to your passkey, the PRF symmetric key is re-created locally. Your PRF-encrypted account encryption key and PRF-encrypted private key are sent from the server to your client. Using WebAuthn API public key cryptography, your authentication request is asserted and affirmed. When a passkey is used to log in and, specifically, to decrypt your vault data: Your passkey private key, which is required to accomplish authentication, only ever leaves the client in an encrypted format. If your passkey is registered with support for vault encryption and decryption, this record includes: Your client sends data to Bitwarden servers to create a new passkey credential record for your account. The PRF private key is encrypted with the PRF symmetric key (see Step 2) and the resulting PRF-encrypted private key is sent to the server. The PRF public key encrypts your account encryption key, which your client will have access to by virtue of being logged in and unlocked, and the resulting PRF-encrypted account encryption key is sent to the server. This key is derived from an internal secret unique to your passkey and a salt provided by Bitwarden.Ī PRF public and private key pair is generated by the Bitwarden client. This key pair, by definition, is what constitutes your passkey.Ī PRF symmetric key is generated by the authenticator via the WebAuthn API's PRF extension. When a passkey is registered for log in to Bitwarden:Ī passkey public and private key pair is generated by the authenticator via the WebAuth API. ![]() This option will only appear if your passkey and browser are PRF-capable. If you dont want to use your passkey for vault encryption and decryption, uncheck the Use for vault encryption checkbox: Use passkey for vault encryption You may, during this procedure, need to cancel out of a default authenticator your browser will want you to use, for example if you want to use a hardware security key on a macOS device that will prioritize Touch ID. You can complete user verification using a factor like a biometric or by creating a PIN. ![]() You will be prompted to enter your master password: Turn on login with passkeysįollow prompts from your browser to create a FIDO2 passkey. ![]() In the Log in with passkey section, select Turn on or, if you've already setup a passkey, New passkey. In the web app, select the profile icon and choose Account settings from the dropdown menu.įrom the Account Settings menu, select the Security page and the Master password tab. To create a passkey to use to log in to Bitwarden: You can have up to 5 passkeys to log in with at any given time. ![]()
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