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<H1>Random Walk Gossip</H1>

<p>As part of the Hastily Formed Networks project we have developed a
protocol for disseminating information in a wireless network without
the need for fixed infrastructure. The protocol is called Random Walk
Gossip (RWG). RWG disseminates a message to any number of mobile nodes
in an ad hoc network of devices that is intermittently connected. This
is done in an energy efficient manner to delay the depletion of the
battery.
 </p>


<h2>Android implementation</h2>

<p>The RWG protocol has been implemented to run on Android platforms.
This implementation allows users to communicate with each other  
without the need for a wireless router
or a base station. In  situations where the cellular telephony network
is unavailable  (e.g. in remote  places or disaster  situations), this
can be the only means of communcation available.</p>

<center>
<img src="androidadhoc.png" width="400">
</center>

<p>In addition to the actual network protocol, a chat
application implemented on top of it has been already developed. 
Both, the network protocol and the chat application are 
compatible with the former 
<a href="http://www.ida.liu.se/~rtslab/code/HFN/rwg-symbian/">Symbian implementation</a>.</p>

<center>
<img src="app-chat-for-web.png">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<img src="app-stats-for-web.png">
</center>

<p>A <a href="http://www.ida.liu.se/~rtslab/code/HFN/rwg-android/rwg-android-gustav/">former RWG implementation</a> for Android (Summer 2009) was also integrated in a crisis
management tool called POSIT, developed at Trinity College,
Hartford. </p>

<H2>General Survivability Framework</H2>

<p>The Android implementation of RWG also includes a prototype of the General Survivability Framework, an
intrusion detector and response mechanism for the survivability of the network in case
of attacks to the ad hoc communication.</p>


<h2> Files </h2>

<p> The last code for Android devices is available for scholarly research. 
To receive a copy of the code please send an e-mail to <a href="mailto:simin.nadjm-tehrani@liu.se">Simin Nadjm-Tehrani</a> with your affiliation, including the university, lab, and professor. </p>

<p>Last revision of code: 08/11/2011</p>

<p>For more information about the actual implementation the following article is available:</p>

<p>
<a name="cucurull-nordsec-2011">J. Cucurull, S. Nadjm-Tehrani, and M.
  Raciti, <B>Modular anomaly detection for smartphone ad hoc communication</B>,
  in <I>16th Nordic Conference on Secure IT Systems, NordSec 2011</I>, LNCS,
  Springer Verlag, October 2011.</a>
</p>



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