[freehaven-cvs] compress secs 7 and 8, add new subsec

[arma@seul.org (Roger Dingledine)]

Update of /home/freehaven/cvsroot/doc/routing-zones
In directory moria.mit.edu:/home2/arma/work/freehaven/doc/routing-zones

Modified Files:
	routing-zones.tex 
Log Message:
compress secs 7 and 8, add new subsec


Index: routing-zones.tex
===================================================================
RCS file: /home/freehaven/cvsroot/doc/routing-zones/routing-zones.tex,v
retrieving revision 1.60
retrieving revision 1.61
diff -u -d -r1.60 -r1.61
--- routing-zones.tex	29 Jan 2004 06:41:25 -0000	1.60
+++ routing-zones.tex	29 Jan 2004 07:03:44 -0000	1.61
@@ -952,17 +952,16 @@
 
 \subsection{Improving Jurisdictional Independence with Node Placement}
 
-Our analysis of inter-mix network paths suggests that currently deployed
-mix networks could benefit from increased diversity in node placement,
-to reduce the probability that inter-node paths traverse the same AS.
-But as mix networks expand, would nodes in certain ASes help to achieve
+%Our analysis of inter-mix network paths suggests that currently deployed
+%mix networks could benefit from increased diversity in node placement,
+%to reduce the probability that inter-node paths traverse the same AS.
+As mix networks expand, would nodes in certain ASes help to achieve
 diversity better than others?
-
-Our results suggest that mix nodes
+Our results suggest that nodes
 in edge networks (e.g., cable modem and DSL providers,
 universities, etc.) are likely to traverse the same AS on both the
 inbound and outbound paths to those nodes.  Far-flung node locations
-that provide significant geographical diversity, such as nodes in Asia,
+that provide geographical diversity, such as nodes in Asia,
 are likely to actually
 {\em reduce} jurisdictional independence, because such nodes do not
 typically have diverse AS-level connectivity.  Rather, the best place
@@ -974,7 +973,33 @@
 increasing jurisdictional independence.  Exploring this question is an
 excellent direction for future work.
 
+\subsection{Other issues}
+
+Several other factors complicate our analysis; we leave them for future
+work.
+
+First, companies like Akamai provide web hosting spread around the globe to
+be close to any given user. They therefore present a real problem for
+this analysis. Because the exit node will choose a nearby Akamai
+server, Alice can no longer use the scheme in Section~\ref{sec:mix_aspath}
+to estimate the AS-level path between the exit node and her destination.
+Also, Akamai itself becomes a powerful global adversary with respect
+to certain popular websites.
+
+Second,
+how sensitive is our independence metric to addition or removal of a
+few nodes in the topology? It seems quite insensitive, but more research
+remains.
+
+Third,
+our choice of popular locations for initiator and responder were all
+inside the United States. Does the analysis change for foreign users?
 
+Fourth,
+for Alice to use this approach, she must periodically fetch routing tables
+and estimate the Internet's topology---which requires lots of computation
+and bandwidth. We must devise a way to condense the data this information;
+directory servers could then provide periodic signed snapshots.
 
 %% 	B. How do these results change as we change our assumptions
 %% 	   about the set of nodes from which you can select:
@@ -999,8 +1024,9 @@
 \section{Conclusion}
 
 We propose that mix networks aiming to achieve jurisdictional diversity
-should consider the underlying AS-level paths.  Our paper
-brings to light several interesting and important results:
+should consider the underlying AS-level paths. %  Our paper
+%brings to light several interesting and important results:
+Our results include:
 
 \begin{tightlist}
 \item While previous systems have proposed

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