> > > Thank you Alexander. > > Do you know of any such product which doesn't need LDAP? I've never worked > with LDAP and don't really want to spend time to learn it now. > Would require a bit of work to make it 'universal' but for anything that can use PAM there's google authenticator... http://www.howtogeek.com/121650/how-to-secure-ssh-with-google-authenticators-two-factor-authentication/