In the first article in this series, I explained how to use your GPG key to authenticate your SSH connections. If you're like me, you already have one or more existing SSH keys. And, if you're like me, you also don't want to have to log into every server you use to update the authorized_keys file. A way around this is to import your existing SSH keys into your GPG key. This will eliminate the need for private key files. Doing this has allowed me to eliminate nine other key files, reducing my backup/privacy footprint a lot.
Read more over at the opensource.com where this was originally posted.