[freehaven-cvs] give us a threat model

[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:
give us a threat model


Index: routing-zones.tex
===================================================================
RCS file: /home/freehaven/cvsroot/doc/routing-zones/routing-zones.tex,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -d -r1.3 -r1.4
--- routing-zones.tex	18 Jan 2004 06:55:08 -0000	1.3
+++ routing-zones.tex	18 Jan 2004 07:37:15 -0000	1.4
@@ -107,7 +107,7 @@
 
 \subsection{Overview of Internet Routing}
 
-We eventually would like to determine the networks that packets will
+Our overall goal is to determine the networks that packets will
 traverse between each node of a mix-net.  To do this, we must first
 understand how packets are routed between two arbitrary hosts on the
 Internet.  In this section, we first present a brief overview of
@@ -221,9 +221,20 @@
 
 \subsection{Threat Model}
 
-Briefly describe the threat model here.  Who are we defending against?
-Presumably some government agency (or other malcontent) that can go get
-subpoenas for ISPs.  Also, perhaps the ISPs themselves.
+We aim to improve anonymity against an adversary who can monitor a single
+AS. Such an adversary might be a curious ISP or a corrupt law enforcement
+officer abusing his subpoena powers.
+
+This threat model is based on the assumption that the ability to control
+more than one AS is significantly more rare, either because far fewer
+ISPs exist that control multiple ASs,
+% Is that true?
+or because law enforcement will be less willing to face the increased
+accountability and risk associated with obtaining multiple unapproved
+subpoenas.
+
+By requiring the adversary to control multiple ASs, we raise the bar
+for breaking the anonymity of the system.
 
 \subsection{Mix-nets}
 	A. Overview of how systems like Tor select mix nodes, and our

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