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I have used the libpam support for a couple boxes. A neat way to use two factor auth on the cheap. http://code.google.com/p/google-authenticator/source/browse/

• cpswan 16y ago
  There's a pretty good howto for that at http://www.mnxsolutions.com/security/two-factor-ssh-with-google-authenticator.html http://www.mnxsolutions.com/security/two-factor-ssh-with-goo...
• gst 16y ago
  I use it too. The nice thing is that in the default config you don't need two-factor auth when using public-key auth. So from your trusted terminal you use public-key auth, and only from untrusted terminals you need to use two-factor auth.