Currently, the opennet proposal includes an announcement mechanism where
the node to be announced chooses its location, sends off an announcement
request, and is provided with a bunch of connections near that location
(and leading up to it).

This is arguably insecure; freenet 0.5 had an announcement mechanism
where the network would choose a random location for the node, and give
it some keys and some connections somewhere near it.

However, it should be possible to target a specific location simply by
(inserting and) requesting lots of keys near to it... With a large
network this gets expensive as you have to either know lots of keys, or
create keys which are close to the target.

Are routed announcements a problem? It is not possible to generate a
location randomly then route to it, because an attacker would just use
the latter stage. Routed announcements do have the advantage of getting
the right connections right at the beginning; nodes can start opennet
very quickly.
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