Ed wants to know if he can use a YubiKey authenticator with his iPhone. Leo says it works great with the iPhone. It's what he uses every day, and he thinks that a hardware key is the best two-factor option. How does it work? Leo says you can get one with a Lightning connector or use the NFC mode and tap it on the phone.
Will it work for Linux? Leo says most flavors of Linux, yes. But there are a few that don't support it, but you can add some code to it to make it work. Here's how.