add in a brief cell structure diagram (4cfffbb9) · Commits · The Tor Project / Core / debian / tor

doc/cell-struct.eps

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doc/cell-struct.fig

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doc/cell-struct.pdf

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doc/tor-design.tex

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		@@ -6,6 +6,7 @@
		\usepackage{url}
		\usepackage{graphics}
		\usepackage{amsmath}
		\usepackage{epsfig}

		\pagestyle{plain}

		@@ -36,6 +37,12 @@
		% \setlength{\topsep}{0mm}
		}}{\end{list}}

		% Cut down on whitespace above and below figures displayed at head/foot of
		% page.
		\setlength{\textfloatsep}{3mm}
		% Cut down on whitespace above and below figures displayed in middle of page
		\setlength{\intextsep}{3mm}

		\begin{document}

		%% Use dvipdfm instead. --DH
		@@ -168,8 +175,8 @@ that can be unreliable and complex. % open to partitioning attacks.
		Tor takes a simplified view toward distributing this
		information. Certain more trusted nodes act as \emph{directory
		servers}: they provide signed directories describing known
		routers and their current state. Users periodically download these
		directories via HTTP.
		routers and their current state. Users periodically download them
		via HTTP.

		\textbf{Variable exit policies:} Tor provides a consistent mechanism
		for each node to advertise a policy describing the hosts
		@@ -595,9 +602,7 @@ checking; the length of the relay payload; and a relay command.
		The entire contents of the relay header and the relay cell payload
		are encrypted or decrypted together as the relay cell moves along the
		circuit, using the 128-bit AES cipher in counter mode to generate a
		cipher stream.
		The
		relay commands are: \emph{relay
		cipher stream. The relay commands are: \emph{relay
		data} (for data flowing down the stream), \emph{relay begin} (to open a
		stream), \emph{relay end} (to close a stream cleanly), \emph{relay
		teardown} (to close a broken stream), \emph{relay connected}
		@@ -607,7 +612,17 @@ and to acknowledge), \emph{relay truncate} and \emph{relay truncated}
		(to tear down only part of the circuit, and to acknowledge), \emph{relay
		sendme} (used for congestion control), and \emph{relay drop} (used to
		implement long-range dummies).
		We describe each of these cell types and commands in more detail below.
		We give a visual overview of cell structure plus the details of relay
		cell structure, and then describe each of these cell types and commands
		in more detail below.

		\begin{figure}[h]
		\unitlength=1cm
		\centering
		\begin{picture}(8.0,1.5)
		\put(4,.5){\makebox(0,0)[c]{\epsfig{file=cell-struct,width=7cm}}}
		\end{picture}
		\end{figure}

		\SubSection{Circuits and streams}
		\label{subsec:circuits}
		@@ -1816,7 +1831,7 @@ application integration is described more fully below.
		service from the DHT.
		\item Alice chooses an OR as the rendezvous point (RP) for this
		transaction. She builds a circuit to the RP, and gives it a
		rendezvous cookie that it will use to recognize Bob.
		rendezvous cookie to recognize Bob.
		\item Alice opens an anonymous stream to one of Bob's introduction
		points, and gives it a message (encrypted to Bob's public key)
		that tells him