See my [safecookie-v2](https://gitweb.torproject.org/rransom/torspec.git/shortlog/refs/heads/safecookie-v2) torspec branch ( `https://git.torproject.org/rransom/torspec.git safecookie-v2` ) for a spec-change branch specifying the new ‘safe cookie authentication’ protocol. See my [safecookie-022-v2](https://gitweb.torproject.org/rransom/tor.git/shortlog/refs/heads/safecookie-022-v2) tor branch ( `https://git.torproject.org/rransom/tor.git safecookie-022-v2` ) for a code-change branch implementing it on maint-0.2.2.