+Good news! [I've crafted a patch for GnuTLS to enable it to read
+exported subkeys using this GNU
+extension](http://lists.gnu.org/archive/html/gnutls-devel/2008-08/msg00005.html),
+so if we can get it incorporated into upstream (and/or into debian),
+we have a possible solution, as long as the authentication key is a
+subkey, and not a primary key.
+
+As of version 0.11-1, `monkeysphere subkey-to-ssh-agent` implements
+this particular strategy (and fails cleanly if the version of GnuTLS
+present doesn't support the GNU dummy S2K extension).
+