Auto-BAHN is a cool project that was presented at DEFCON 2011 that can be used in emergency situations to still get a message out.
Thomas Wilhelm showed at the DEFCON 2011 an interesting project dubbed Auto-BAHN. The idea is that smartphone users can still get a message out in the event of an emergency when cellular fails or is not available. Auto-BAHN uses Wi-Fi and Bluetooth to get a message from one smartphone to the next until it reaches its destination.
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There is already an Auto-Bahn Android App, but ideally Mr. Wilhelm would like to have all handset maker implement Auto-Bahn as a basic feature in their products. The Android App is just a proof of concept and helps to transport the idea. I think this is a really awesome idea when you consider disaster situations like Katrina or the Japanese earthquake.
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