[or-cvs] r15902: Add first version of mid-July report. (projects/hidserv/trunk/doc)

kloesing at seul.org kloesing at seul.org
Mon Jul 14 15:36:10 UTC 2008 

Author: kloesing
Date: 2008-07-14 11:36:10 -0400 (Mon, 14 Jul 2008)
New Revision: 15902

Added:
   projects/hidserv/trunk/doc/boxoverlier.pdf
   projects/hidserv/trunk/doc/boxparconn.pdf
   projects/hidserv/trunk/doc/descup.png
   projects/hidserv/trunk/doc/discussion.pdf
   projects/hidserv/trunk/doc/discussion.tex
   projects/hidserv/trunk/doc/firstpub.png
Log:
Add first version of mid-July report.

Added: projects/hidserv/trunk/doc/boxoverlier.pdf
===================================================================
--- projects/hidserv/trunk/doc/boxoverlier.pdf	                        (rev 0)
+++ projects/hidserv/trunk/doc/boxoverlier.pdf	2008-07-14 15:36:10 UTC (rev 15902)
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--- projects/hidserv/trunk/doc/discussion.tex	                        (rev 0)
+++ projects/hidserv/trunk/doc/discussion.tex	2008-07-14 15:36:10 UTC (rev 15902)
@@ -0,0 +1,292 @@
+\documentclass{article}
+\usepackage[dvips]{graphicx}
+\usepackage{graphics}
+\usepackage{color}
+\usepackage{url}
+\begin{document}
+
+\title{Discussion of Possible Design Changes to\\Improve Tor Hidden Service Performance}
+\date{July 15, 2008}
+\author{The Tor Project\footnote{Please direct questions and comments
+either to \texttt{tor-assistants at torproject.org} or
+\texttt{or-dev at freehaven.net}.}}
+\maketitle
+
+\begin{abstract}
+This document describes possible design changes aiming at improving
+performance of Tor Hidden Services. The ideas for these improvements come
+from an earlier analysis of possible performance
+bottlenecks\footnote{\url{http://freehaven.net/~karsten/hidserv/perfanalysis-2008-06-15.pdf}}.
+Optimally, the results of the discussion of these ideas will be included in
+a Tor proposal by August 15, 2008.
+\end{abstract}
+
+\section{Rendezvous Protocol Simplifications}\label{sec:rendsimpl}
+\textit{{\O}verlier and Syverson proposed two simplified rendezvous
+protocols.}\footnote{Lasse {\O}verlier and Paul Syverson, Improving
+Efficiency and Simplicity of Tor Circuit Establishment and Hidden Services,
+\url{http://www.freehaven.net/anonbib/#overlier-pet2007}} \textit{Their
+first protocol aims at using a single circuit on client-side to contain the
+rendezvous point and connect to an introduction point. The second protocol
+goes the extra mile to unite the roles of introduction point and rendezvous
+point and save another circuit. It can be assumed that these
+simplifications improve connection establishment times. However, they have
+yet unclear effects on anonymity, given that they are implemented without
+the authors' proposed valet node approach which requires a major redesign
+of hidden services.}
+
+A possible design of the second protocol that unites the roles of
+introduction and rendezvous point is described in proposal
+142\footnote{\url{https://tor-svn.freehaven.net/svn/tor/trunk/doc/spec/proposals/142-combine-intro-and-rend-points.txt}}
+and in a revised rendezvous
+specification\footnote{\url{https://tor-svn.freehaven.net/svn/tor/branches/121-hs-authorization/doc/spec/rend-spec-v3draft.txt}}.
+Applying the new design would have the following effects:
+
+\begin{description}
+\item[Performance Improvement of 8 Seconds (30\%)] A
+pre-evaluation\footnote{Christian Wilms, Improving the Tor Hidden Service
+Protocol Aiming at Better Performance, diploma thesis, June 2008} of this
+design change has shown that mean connection establishment times can be
+reduced from 27.4 seconds in the original protocol to 19.1 seconds in the
+changed design. Figure~\ref{fig:overlier} shows a comparison of connection
+establishment times.
+%
+\begin{figure}[tb]
+\centering
+\includegraphics[width=\textwidth]{boxoverlier.pdf}
+\begin{tabular}{lrrrrrr}
+Protocol & Min. & 1st Qu. & Median & Mean & 3rd Qu. & Max.\\\hline
+Regular & 2.479 & 11.450 & 18.210 & 27.370 & 33.220 & 181.800\\
+Simplified & 1.324 & 7.070 & 11.740 & 19.130 & 21.450 & 125.600
+\end{tabular}
+\caption{Connection establishment times for combining introduction and
+rendezvous points}
+\label{fig:overlier}
+\end{figure}
+%
+\item[Responsibility of Serving a Hidden Service] One of the original
+reasons for the separation of introduction and rendezvous points is that a
+relay shall not be made responsible that it relays data for a certain
+hidden service. The changed design needs to make sure that a combined
+introduction and rendezvous points cannot learn on behalf of which hidden
+service it is working.
+%
+\item[Scalability] On the one hand, the simplified protocol removes the
+need for a hidden service to establish new circuits on demand. On the other
+hand, the service needs to maintain a number of open circuits proportional
+to the expected number of client requests.
+%
+\item[Attack Resistance] An attacker who can take down a combined
+introduction and rendezvous point does not only eliminate an access point
+to the hidden service, but also breaks current client connections to the
+hidden service using that contact point.
+\end{description}
+
+\section{Parallel Connections to Introduction Points}
+\textit{A client could attempt to establish two introduction circuits to
+two different introduction points simultaneously and only use the first
+that succeeds. The slower circuit could still be used for another purpose.
+However, there is a possible anonymity issue here that needs to be taken
+under consideration, because the circuit can now be linked to one of the
+hidden service's introduction points. Further, it needs to be evaluated
+whether the extension of two circuits at the same time has a negative
+effect on clients with low bandwidth.}
+
+\begin{description}
+\item[Performance Improvement of 5 Seconds (18\%)] Another pre-evaluation
+resulted in a possible reduction of connection establishment times from
+27.4 seconds in the original protocol to 22.5 seconds in the changed
+design. Figure~\ref{fig:parintro} shows the possible improvement of
+connection establishment times.
+%
+\begin{figure}[tb]
+\centering
+\includegraphics[width=\textwidth]{boxparconn.pdf}
+\begin{tabular}{lrrrrrr}
+Protocol & Min. & 1st Qu. & Median & Mean & 3rd Qu. & Max.\\\hline
+Regular & 2.479 & 11.450 & 18.210 & 27.370 & 33.220 & 181.800\\
+Par. Conn. & 1.987 & 9.212 & 14.140 & 22.450 & 24.990 & 144.800
+\end{tabular}
+\caption{Connection establishment times for parallel connections to
+introduction points}
+\label{fig:parintro}
+\end{figure}
+%
+\item[More Internal Circuits Required] Clients need to maintain a higher
+number of internal circuits in order to use two parallel circuits to
+connect to an introduction point. This number should have a fixed lower
+bound that is by 1 higher than the current limit and could be increased
+based on the history of hidden service accesses.
+%
+\item[Increase of Overall Network Load] If the slower circuit is discarded
+after the first introduction point has been established, there will be an
+additional load on the network. In particular, $3+1=4$ circuit extensions
+will be lost.
+%
+\item[Dealing with Loser Circuits] If slower circuits are not discarded,
+they can be kept in a pool for later internal circuit usage. However, in
+addition to being slow anyway, these circuits might need to be extended for
+another usage which will make them even slower. Therefore, they should be
+discarded after they reach a certain length, e.g.\ 6 hops.
+%
+\item[Anonymity Issues with Loser Circuits] There should not be any
+anonymity issues with slower circuits, because they were never told that
+they were intended to be used as introduction circuits.
+\end{description}
+
+\section{Individual Cannibalization Timeouts}
+An idea that was not described in the last report is to introduce
+individual timeouts for cannibalizing a circuit and extending it to an
+introduction point afterwards. The current timeout for this task is 60
+seconds. Figure~\ref{fig:introest} contains a histogram of times that are
+required for this task. 
+
+Assuming that the timeout would be reduced to a lower value, a second
+(or third) attempt to cannibalize and extend a circuit would be started
+earlier. Figure~\ref{fig:X} shows the overall introduction circuit
+cannibalization and extension times for timeouts between 10 and 60 seconds.
+%As a simplification, the assumption is made that circuit estalishments can
+%be accomplished within at most three timeouts. % TODO Christian: Can we
+%drop this assumption?
+
+\begin{description}
+\item[Performance Improvement of X Seconds (X\%)]
+%
+\begin{figure}[tb]
+\centering
+%\includegraphics[width=0.8\textwidth]{introest.png}
+\emph{TODO Christian: Insert histogram of introduction circuit establishment times here, together with summary of values. Also insert the average
+number of requests as a function of timeout.}
+\caption{Introduction circuit establishment times}
+\label{fig:introest}
+\end{figure}
+%
+\emph{TODO Christian: Insert diagram with average introduction circuit
+establishment times as a function of timeouts.}
+%
+\item[Effect on Low-Bandwidth Clients] All measurements so far have been
+performed on high-bandwidth clients. If there is a significant influence of
+bandwidth on cannibalization time, relays should keep a history of past
+circuit establishment times and adapt their individual timeouts by applying
+exponential smoothing on historical values.
+%
+\item[Increased Network Load] There will be an increased share of circuits
+that are discarded after the new timeout expires, but would have been
+completed within the existing timeout of 60 seconds.
+\end{description}
+
+\section{Increase Count of Internal Circuits}
+\textit{The number of preemptively built internal circuits for later
+cannibalization should be increased. Really popular hidden services require
+more than two internal circuits in the pool to answer multiple client
+requests at the same time. This scenario was not yet analyzed, but will
+probably exhibit even worse performance as measured here. The number of
+preemptively built internal circuits should be a function of connection
+requests in the past to adapt to changing needs. Furthermore, an increased
+number of internal circuits on client side would allow clients to establish
+connections to more than one hidden service at a time.}
+
+\begin{description}
+\item[Performance Improvement of ?? Seconds (??\%)] It is assumed that a
+popular hidden service cannot make use of cannibalization for
+connecting to rendezvous points, but needs to create new circuits.
+Therefore, the circuit creation time needs to be added to the current
+results. An evaluation of internal circuit creating times is shown in
+Figure~\ref{fig:Y}. In the mean the connection establishment time to a
+popular hidden service would increase by Z seconds.
+\item[Dependency on Regular Hidden Service Protocol] This design change only
+makes sense if the design change described in Section~\ref{sec:rendsimpl}
+is \emph{not} applied.
+\item[Higher Number of Internal Circuits] A hidden service would have to
+maintain a higher number of internal circuits to respond to client
+requests. Each service needs to maintain a history of client requests to
+have a good estimate for the number of required internal circuits.
+\end{description}
+
+\section{Build More Introduction Circuits}
+\textit{When establishing introduction points, a hidden service could
+launch 5 instead of 3 introduction circuits at the same time and use only
+the first 3 that could be established. The remaining two circuits could
+still be used for other purposes afterwards.}
+
+\begin{description}
+\item[Performance Improvement of ?? Seconds (??\%)] The effect of choosing
+the fastest 3 out of 5 circuit creations as introduction points has been
+evaluated using previously measured data, too. Therefore, circuit
+establishment times were derived from log files and written to an array.
+Afterwards, a simulation with XY runs was performed picking 5 random values
+and using
+the 3 lowest values in contrast to picking only 3 values at random. The
+result is that the mean time of the 3-out-of-5 approach is A, while the
+mean time of the 3-out-of-3 approach is B.
+\item[Network Load] The effect on network load is minimal, because the hidden service can reuse the slower internal circuits for other purposes.
+\end{description}
+
+\section{Descriptor Upload Timing}
+\textit{The choice to wait for 30 seconds for a service to have a stable
+set of introduction points is rather arbitrary. An analysis of typical
+delays in establishing introduction points might help to apply a more
+suitable algorithm here.}
+
+When finding a useful algorithm for uploading rendezvous descriptors, there
+are two conflictive objectives: a) upload descriptors as early as possible
+and b) avoid uploading descriptors that need to be replaced shortly after.
+An evaluation of introduction point establishments and abandonings within
+the first 30 minutes of providing a hidden service can help determining the
+optimal delay. One can determine the number of uploaded descriptors from
+empirical data for every possible delay.
+
+\begin{description}
+\item[Descriptor Publication Delay] Figure~\ref{fig:firstpub} shows the
+delays in descriptor publication for stabilization times between 1 and 90
+seconds.
+\item[Number of Published Descriptors] Figure~\ref{fig:stabtime} displays
+the mean number of published descriptors. These results show that there is
+a clear trade-off between the two objectives for delays lower than 50
+seconds. A delay of 60 seconds significantly reduces the mean number of
+published descriptors, but at the price of almost doubling the mean upload
+time of the first descriptor as compared to the current choice of 30
+seconds.
+\end{description}
+
+% first <- read.csv("firstdesc.csv",sep = ",",header=TRUE, row.names=NULL); png(paste("firstpub", "png", sep="."), width=800, height=600); plot(mean(first/1000),type="o",ylim=c(0,mean(first$firstdesc90)/1000),xlab="Stabilization time before descriptor upload (s)",ylab="Mean time until first descriptor publication (s)"); abline(a=0, b=1, lty=2); dev.off()
+\begin{figure}[tb]
+\centering
+\includegraphics[width=0.8\textwidth]{firstpub.png}
+\caption{Time until first descriptor upload as a function of stabilization time}
+\label{fig:firstpub}
+\end{figure}
+
+% stable <- read.csv("theorupl.csv",sep = ",",header=TRUE, row.names=NULL); png(paste("descup", "png", sep="."), width=800, height=600); plot(mean(stable),type="o",xlab="Stabilization time before descriptor upload (s)",ylim=c(0,mean(stable$stable1)),ylab="Mean number of uploaded descriptors"); abline(a=1, b=0, lty=2); dev.off()
+\begin{figure}[tb]
+\centering
+\includegraphics[width=0.8\textwidth]{descup.png}
+\caption{Number of uploaded descriptors as a function of stabilization time}
+\label{fig:stabtime}
+\end{figure}
+
+\section{Descriptor Upload Failures}
+\label{sec:descuplfailures}
+\textit{The current logic to upload rendezvous service descriptors does not
+handle failures in a reasonable way. In case of a failure, Tor waits for a
+solid hour before making the next attempt. There should either be a smaller
+timeout or an individual handling of failures per directory.}
+
+This bug is described in detail in task
+767\footnote{\url{http://bugs.noreply.org/flyspray/?do=details&id=767}}.
+The fix, however, requires on-demand downloading of router descriptors,
+which might have anonymity issues. Therefore, this bugfix requires
+discussion of the possible consequences.
+
+\begin{description}
+\item[Higher Reliability] An evaluation has shown that 14.7\% of all
+descriptor uploads to the three central hidden service authorities failed.
+A subsequent analysis has confirmed these results for the distributed
+storage for hidden service descriptors with a failure rate of 13.7\%.
+\item[Anonymity Issue] A hidden service needs to download a specific set of
+router descriptors in order to store its hidden service descriptor. This
+might reveal the hidden service identity to everyone observing a request
+for router descriptors.
+\end{description}
+\end{document}
+

Added: projects/hidserv/trunk/doc/firstpub.png
===================================================================
(Binary files differ)


Property changes on: projects/hidserv/trunk/doc/firstpub.png
___________________________________________________________________
Name: svn:mime-type
   + application/octet-stream

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