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Using Yubi keys for 2fa Linux desktop login

To configure one or more yubi keys to act as a 2fa challenge for Linux desktop login do the following:

Step 1 - Prepare the system

Resetting a Yubi key GPG card to default

If you lock a Yubi key's GPG functionality by entering the admin pin wrong 3 times (or some how just screw it up) do the following:

Copy this into a …

Using Yubi keys for GPG/SSH keys

I've recently replaced my GPG keys with new ones stored on Yubi keys, why? Well...

  1. To use a master key and sub keys, previously I only had a master key …