… as at the moment, the data lives on the device “in a local unencrypted database”:
(source: Authenticator app - FAQs | Bitwarden Help)
So, e.g. a biometrics or PIN/password option (I think as other authenticator apps implement it) or even a “passkey” option to encrypt the locally stored data of the authenticator app would make sense.
Some thoughts to the (not yet implemented) sync option of the authenticator app:
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When the syncing function between authenticator app and Bitwarden account/vault will arrive, I honestly can’t imagine, that this data will then also be unencrypted…
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However, when you use the authenticator app without the sync-function (in the future), the data probably should also be locally “encryptable” on the device.