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@@ -679,11 +679,14 @@ the shared directory is straightforward, and is described in the Tor
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specification \cite{tor-spec}.
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% we should, uh, add this to the spec. oh, and write it. -RD
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-Because the directories are signed, they can be cached at all the other
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-onion routers (or even elsewhere). Thus directory servers are not a
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-performance bottleneck when we have many users, and also they won't
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-aid traffic analysis by forcing clients to periodically announce their
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-existence to any central point.
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+Using directory servers rather than flooding approaches provides
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+simplicity and flexibility. For example, they don't complicate
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+the analysis when we start experimenting with non-clique network
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+topologies. And because the directories are signed, they can be cached at
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+all the other onion routers (or even elsewhere). Thus directory servers
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+are not a performance bottleneck when we have many users, and also they
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+won't aid traffic analysis by forcing clients to periodically announce
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+their existence to any central point.
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\Section{Rendezvous points: location privacy}
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\label{sec:rendezvous}
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