Switching yubikeys

In this post I described how I set up gpg keys on a yubikey. Since I have multiple yubikeys for some redundancy I occasionally have to use a different one. This basically involves deleting the secret key and re-importing it from the yubikey.

On OSX

Open up GPG keychain and click through the scary warning to delete the secret keys. If you set it up right these are only stubs, the actual key is on the yubikey. Once you've done that, insert the key you want to use and get the stubs recreated with:

$ gpg --card-status