I was hoping to use my Yubikey for file encryption, but also wanted to have a backup Yubikey work to unlock the file.
From a conceptual point of view, I know it is possible since, even as is, I believe many encryptions work by symmetrically encrypting an asymmetric password used to encrypt the rest of the data, so all I would need is multiple encryptions of the asymmetric password for each key.
I'm not sure which tools support this kind of encryption, but was hoping to find a tool that:
- Supports use of multiple yubikeys
- Bonus: Works well with cloud storage by encrypting files individually or otherwise breaks up the file into smaller pieces only some of which need to be reuploaded when a file changes.