@@ -13,6 +13,15 @@

     <a id="BridgeIntroduction"></a>

     <h2><a class="anchor" href="#BridgeIntroduction">Tor: Bridges</a></h2>

     <hr>

+

+    <p>

+    <img width="7%" height="7%" style="float: left;" src="$(IMGROOT)/icon-Obfsproxy.jpg">

+    <b>Tip:</b>

+    Having trouble connecting to Tor even when using bridges? You will

+    need to use <b>pluggable transports</b> and <b>obfuscated

+    bridges</b>. <a class="anchor" href="#PluggableTransports">Click

+    here for more information</a>.

+    </p>

     <p>

     Bridge relays (or "bridges" for short) are Tor relays that aren't listed in

@@ -70,10 +79,29 @@

     href="#FindingMore">other ways to find bridges</a> too.

     </p>

-    <a id="Understanding"></a>

-    <h2><a class="anchor" href="#Understanding">Understanding bridges</a></h2>

+    <a id="PluggableTransports"></a>

+    <h2><a class="anchor" href="#PluggableTransports">Obfuscated Bridges and Pluggable Transports</a></h2>

     <hr>

+    <p> Lately, censors have found ways to block Tor even when clients

+    are using bridges. They usually do this by installing boxes in

+    ISPs that peek at network traffic and detect Tor; when Tor is

+    detected they block the traffic flow.

+    </p>

+

+    <p>To circumvent such sophisicated censorship Tor introduced

+    <i>obfuscated bridges</i>. These bridges use special plugins

+    called <i>pluggable transports</i> which obfuscate the traffic

+    flow of Tor, making its detection harder.

+

+    To connect to obfuscated bridges you need to use the <a

+    href=https://www.torproject.org/projects/obfsproxy.html.en#download>Obfproxy

+    Tor Browser Bundle</a>. The bundle includes some pre-configured

+    obfsproxy bridges and you can get more off <a

+    href=https://bridges.torproject.org/?transport=obfs2>BridgeDB</a>

+

+    <a id="Understanding"></a>

+    <h2><a class="anchor" href="#Understanding">Understanding bridges</a></h2><hr>

     <p>

     As an example, you'll get a bridge entry that looks like the

     following:

@@ -90,8 +118,23 @@

     The second element is the port: <tt>'443'</tt><br>

     The third element, the fingerprint, is optional:

     <tt>'4352e58420e68f5e40bf7c74faddccd9d1349413'</tt><br>

+

+    <p>

+    <img width="7%" height="7%" style="vertical-align:middle" src="$(IMGROOT)/icon-Obfsproxy.jpg">

+         <span><b>Pluggable transports tip:</b></span>

     </p>

-    

+    <p>

+    If your bridge line looks like this:

+    <pre><samp>

+    bridge obfs2 141.201.27.48:420 4352e58420e68f5e40bf7c74faddccd9d1349413

+    </samp>

+    </pre>

+

+    The second element is the name of the pluggable transport

+    technology used by the bridge. For example, in the case above, the

+    bridge is using the <i>obfs2</i> pluggable transport.

+    </p>

+

     <a id="UsingBridges"></a>

     <h2><a class="anchor" href="#UsingBridges">Using bridges with Tor and

     Vidalia</a></h2>

@@ -115,6 +158,21 @@

     to reach the Tor network, but if you only have one bridge and it goes

     down, you will be cut off from the Tor network.

     </p>

+

+    <p>

+    <img width="7%" height="7%" style="vertical-align:middle" src="$(IMGROOT)/icon-Obfsproxy.jpg">

+         <span><b>Pluggable transports tip:</b></span>

+    </p>

+    <p>

+

+    If you have managed to get hold of some obfuscated bridge

+    addresses, you should add them in Vidalia in the same fashion that

+    you add normal bridges. Just paste the bridge line into the "Add a

+    bridge" window:

+

+    <br><br>

+    <img src="$(IMGROOT)/vidalia_add_obfsbridge.png" alt="Add obfuscated bridge in Vidalia">

+    <br><br>

     <a id="FindingMore"></a>

     <h2><a class="anchor" href="#FindingMore">Finding more bridges for Tor</a></h2>

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