Ubuntu Saucy repo missing deb.torproject.org-keyring
It appears that the repo for Ubuntu Saucy is missing the deb.torproject.org-keyring package.
http://deb.torproject.org/torproject.org/dists/saucy/main/binary-i386/Packages http://deb.torproject.org/torproject.org/dists/saucy/main/binary-amd64/Packages vs http://deb.torproject.org/torproject.org/dists/raring/main/binary-amd64/Packages http://deb.torproject.org/torproject.org/dists/raring/main/binary-i386/Packages
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