+- The ``introducer.furl`` for new Introducers is now unguessable. In previous
+ releases, this FURL used a predictable swissnum, allowing a network
+ eavesdropper (who observes any node connecting to the Introducer) to access
+ the Introducer themselves, and thus use servers or offer storage service to
+ clients (i.e. "join the grid"). In the new code, the only way to join a
+ grid is to be told the introducer.furl by someone who already knew it. Note
+ that pre-existing introducers are not changed: to take advantage of this
+ fix for an existing grid, you must create a new introducer and distribute
+ the new ``introducer.furl`` to all of your users. (`#1802`_)
+- Both ``introducer.furl`` and ``helper.furl`` are now censored from the
+ Welcome page, to prevent users of your gateway from learning enough to
+ create gateway nodes of their own. (`#860`_)