Lastpass also uses Google Authenticator. You can get server-side code so you can use Google Authenticator on your own server, or use it to offer two-factor au

Lastpass also uses Google Authenticator. You can get server-side code so you can use Google Authenticator on your own server, or use it to offer two-factor authentication to a web service you are running. It's an open protocol, with an open source implementation. All you have to use it.