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I'd like to encrypt some data on the server using a user-managed secret. I could just ask for a password and derive a key from that, but ideally I'd like to offer users the option of using a yubikey to safeguard the data. This way it would be more resistant to a DB leak scenario and potentially avoid replay attacks.

If I could fully specify the protocol, I'd have a symmetric key encrypted by a client private key, and would ask the client to decrypt the key in order to operate on the data.

Is there a way to leverage webauthn for this?

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Is there a way to leverage webauthn for this?

No. WebAuthn is only about authentication, not encryption.

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