That one seems to recommend the OATH-toolkit, I tried it once and the documentation wasn't impressive (shocker!) and I was concerned about the security aspect a

That one seems to recommend the OATH-toolkit, I tried it once and the documentation wasn't impressive (shocker!) and I was concerned about the security aspect as well. I wonder if anyone has audited that code properly? Google Authenticator PAM module seems to be the other option that is widely used and it's much easier to find information on it.