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Two Factor SSH on Joyent SmartMachines

After reading this scary blog entry about domain hijacking I've been a bit concerned about brute forcing of credentials and have been turning on the two-factor authentication facilities that folks like Google provide for my gmail and personal domains.

I've just found out about Duo Security, a service that allows you to add two-factor authentication to your SSH server, Juniper VPN and even Wordpress blogs. Their service is free for up to 10 users and they start charging when you pass that threshold.

Read on to find out how to set it up.