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add in a brief cell structure diagram
svn:r1036
This commit is contained in:
Roger Dingledine
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%%Title: cell-struct.fig
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@@ -0,0 +1,49 @@
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#FIG 3.2
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Landscape
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Center
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Inches
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Letter
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100.00
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Single
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-2
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1200 2
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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1200 975 1200 1275
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1725 975 1725 1275
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2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
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600 975 4800 975 4800 1275 600 1275 600 975
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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1200 300 1200 600
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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1725 300 1725 600
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2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
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600 300 4800 300 4800 600 600 600 600 300
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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2550 975 2550 1275
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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3150 975 3150 1275
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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3450 975 3450 1275
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2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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3900 975 3900 1275
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4 0 0 50 -1 0 12 0.0000 4 135 510 675 1200 CircID\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 900 900 2\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 1425 900 1\001
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4 0 0 50 -1 0 12 0.0000 4 180 435 1275 1200 Relay\001
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4 0 0 50 -1 0 12 0.0000 4 135 735 1800 1200 StreamID\001
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4 0 0 50 -1 0 12 0.0000 4 180 510 2625 1200 Digest\001
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4 0 0 50 -1 0 12 0.0000 4 135 285 3150 1200 Len\001
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4 0 0 50 -1 0 12 0.0000 4 135 510 4200 1200 DATA\001
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4 0 0 50 -1 0 12 0.0000 4 135 510 675 525 CircID\001
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4 0 0 50 -1 0 12 0.0000 4 135 420 1275 525 CMD\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 900 225 2\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 1425 225 1\001
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4 0 0 50 -1 0 12 0.0000 4 135 510 3225 525 DATA\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 2100 900 6\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 2850 900 4\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 3225 900 2\001
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4 0 0 50 -1 0 12 0.0000 4 135 420 3450 1200 CMD\001
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4 0 0 50 -1 0 12 0.0000 4 135 90 3600 900 1\001
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4 0 0 50 -1 0 12 0.0000 4 180 735 3300 225 509 bytes\001
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Binary file not shown.
@@ -6,6 +6,7 @@
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\usepackage{url}
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\usepackage{graphics}
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\usepackage{amsmath}
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\usepackage{epsfig}
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\pagestyle{plain}
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@@ -36,6 +37,12 @@
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% \setlength{\topsep}{0mm}
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}}{\end{list}}
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% Cut down on whitespace above and below figures displayed at head/foot of
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% page.
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\setlength{\textfloatsep}{3mm}
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% Cut down on whitespace above and below figures displayed in middle of page
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\setlength{\intextsep}{3mm}
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\begin{document}
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%% Use dvipdfm instead. --DH
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@@ -168,8 +175,8 @@ that can be unreliable and complex. % open to partitioning attacks.
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Tor takes a simplified view toward distributing this
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information. Certain more trusted nodes act as \emph{directory
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servers}: they provide signed directories describing known
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routers and their current state. Users periodically download these
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directories via HTTP.
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routers and their current state. Users periodically download them
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via HTTP.
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\textbf{Variable exit policies:} Tor provides a consistent mechanism
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for each node to advertise a policy describing the hosts
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@@ -595,9 +602,7 @@ checking; the length of the relay payload; and a relay command.
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The entire contents of the relay header and the relay cell payload
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are encrypted or decrypted together as the relay cell moves along the
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circuit, using the 128-bit AES cipher in counter mode to generate a
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cipher stream.
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The
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relay commands are: \emph{relay
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cipher stream. The relay commands are: \emph{relay
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data} (for data flowing down the stream), \emph{relay begin} (to open a
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stream), \emph{relay end} (to close a stream cleanly), \emph{relay
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teardown} (to close a broken stream), \emph{relay connected}
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@@ -607,7 +612,17 @@ and to acknowledge), \emph{relay truncate} and \emph{relay truncated}
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(to tear down only part of the circuit, and to acknowledge), \emph{relay
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sendme} (used for congestion control), and \emph{relay drop} (used to
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implement long-range dummies).
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We describe each of these cell types and commands in more detail below.
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We give a visual overview of cell structure plus the details of relay
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cell structure, and then describe each of these cell types and commands
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in more detail below.
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\begin{figure}[h]
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\unitlength=1cm
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\centering
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\begin{picture}(8.0,1.5)
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\put(4,.5){\makebox(0,0)[c]{\epsfig{file=cell-struct,width=7cm}}}
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\end{picture}
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\end{figure}
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\SubSection{Circuits and streams}
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\label{subsec:circuits}
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@@ -1816,7 +1831,7 @@ application integration is described more fully below.
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service from the DHT.
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\item Alice chooses an OR as the rendezvous point (RP) for this
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transaction. She builds a circuit to the RP, and gives it a
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rendezvous cookie that it will use to recognize Bob.
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rendezvous cookie to recognize Bob.
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\item Alice opens an anonymous stream to one of Bob's introduction
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points, and gives it a message (encrypted to Bob's public key)
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that tells him
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