[freehaven-cvs] explain that a single cascade is not sufficient

[arma@seul.org (Roger Dingledine)]

Update of /home2/freehaven/cvsroot/doc/sync-batching
In directory moria.mit.edu:/tmp/cvs-serv4610

Modified Files:
	sync-batching.tex 
Log Message:
explain that a single cascade is not sufficient


Index: sync-batching.tex
===================================================================
RCS file: /home2/freehaven/cvsroot/doc/sync-batching/sync-batching.tex,v
retrieving revision 1.56
retrieving revision 1.57
diff -u -d -r1.56 -r1.57
--- sync-batching.tex	24 Jun 2004 21:20:09 -0000	1.56
+++ sync-batching.tex	25 Jun 2004 00:06:31 -0000	1.57
@@ -407,11 +407,17 @@
 %path free route.)
 %We use the same number for all mixnets to
 %have a reasonably fair comparison of available resources.
-Besides
-being a tractable size for analysis, 16 nodes is also a fairly good
-approximation of actually deployed mixnets. (Mixminion currently has
-between 20 and 30 active nodes.)
-Messages proceed through all of our networks in \emph{layers}; all of the
+Besides being a tractable size for analysis, 16 nodes is also a fairly
+good approximation of actually deployed mixnets. (Mixminion currently
+has between 20 and 30 active nodes.) One might argue that a 4 node mixnet
+provides better security, because all the messages are mixed together
+in any topology. We assume a larger network is needed because 1) the
+bandwidth of a single node may be insufficient to handle all the traffic;
+2) a single path may not include as many choices for jurisdiction as
+some users want; and 3) a single path is not very robust, either to
+network attacks or to nature.
+
+Messages proceed through the network in \emph{layers}; all of the
 nodes in a layer process messages of one mixnet batch at the same time.
 In general we describe networks as $w$x$\ell$, where $w$ is the number
 of nodes at each layer and $\ell$ is the number of nodes in a path.

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