We all know that all software has bugs and that security is hard, but somehow we are still surprised when we see new vulnerabilities.

Setting up a new YubiKey as a second factor is easy—your browser walks you through the entire process. However, setting up a YubiKey to sign your Git commits and Secure Shell (SSH) authentication is a very different experience. In this post, I’ll walk through configuring a YubiKey and highlight some of the things I’ve learned along the way.