this post was submitted on 03 Apr 2024
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Mildly Infuriating
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im definitely an idiot but i couldn't figure out at all how to make a yubikey work with a keepass database on android
Yubikey is only really useful for authentication with a trusted party, and not decryption. You can technically use store a secret key on it but then its two biggest advantages are gone, namely that you can't copy the key and that it doesn't use the limited storage on the device.
What? They are super-usefully for decryption, specifically because of the inability to copy the key.
You can absolutely copy the key, because the device has to give it up to the application during decryption. Or does the application send the encrypted file to the yubikey for it to decrypt it? In which case, that's a lot better and I'm wrong.
You use a GPG key that you then add to the yubikey. The keys can only be written or deleted off the yubikey, you can't read the secret once written. Then you can use the GPG key to either encrypt a file or sign it. Check out Pretty Good Privacy and the GnuPrivacy Guard software for more information on how that works.
I use my yubikey to encrypt files, sign my work in Git, as well as the usual password authenticator stuff. You can still use FIDO, U2F and OTP codes while using the GPG too.
Check out this awesome guide on how to setup an airgapped computer to generate the GPG key. https://github.com/drduh/YubiKey-Guide
I believe that the decryption partially happens on the key
You're talking past each other, some Yubikeys have PGP apples for asymmetric encryption (public / private keypairs), and HMAC is a symmetric single key algorithm where the yubikey sends a resulting value to the PC/phone which is part of the key derivation inputs (even though the yubikey's root key remains secret).
HMAC is a what again?
Hash based message authentication code
Excuse my surface knowledge on this but when setting up TOTP on Yubikey you can choose to only get an OTP on touch which would be pointless if the application had access to the secret at any point. Based on that it's probably not possible to copy it.