Google Authenticator surely is a cute thing. But my current solution isn’t really matching my taste: one token for every app which makes up a total of 20 token for my daily use – about 19 token too much if you’d ask me.
A solution could be a Radius server, having all the users authenticated using a PAM Module – or something completely different. I cancelled the Radius Server as I couldn’t get it to play nice with my LDAP Directory. So I had to search on.