Fixes to last checkin

client about the router membership list, topology, or current network

state. Such \emph{partitioning attacks} on client knowledge help an

adversary to efficiently deploy resources

when attacking a target.

% XXX Cite for partitioning attacks?

when attacking a target \cite{minion-design}.

Tor uses a small group of redundant, well-known onion routers to

track changes in network topology and node state, including keys and

download a description of the entire network state every 15

minutes.  As the state grows larger and clients more numerous, we

may need to move to a solution in which clients only receive

incremental updates to directory state, or where directories are

cached at the ORs to avoid high loads on the directory servers.

incremental updates to directory state.

\emph{Implementing location-hidden servers:} While

Section~\ref{sec:rendezvous} describes a design for rendezvous