Researchers steal data via inaudible acoustic mesh networks By Dimitri Reijerman , Monday, November 25, 2013 19:39, replies: 50 , views: 15,705 • Feedback Scientists at the Fraunhofer Institute have published a study in which they describe a mesh network that uses inaudible acoustic signals. This method could be to use isolated computer. Undetected data captured using In the report “On acoustical mesh networks in covert air ‘ describe how the researchers could send air which actually served as a transport medium. between multiple laptops via modulation and demodulation of audio signals data The used acoustic technology was originally developed for underwater communications, but the technique, in which ultrasonic sound is played through speakers and picked up with microphones, would also be useful, for example, imperceptibly steal from systems that have been deliberately isolated data. According to the Fraunhofer scientists described the technology can be deployed silently to set up a mesh network using multiple nodes partly because sending data over multiple hops has proved possible. In the tests a simple network protocol was used, because TCP / IP is too much overhead and relatively low throughput to meet. By applying acoustic communication are not only applications like secretly setting up a botnet, but the technology would also lend themselves well to keyloggingdoeleinden. Moreover, normally monitored for such attack methods. According to some, the mysterious make -badBIOS malware using a similar method, but this has not been confirmed. The researchers propose as a countermeasure for adding that certain frequencies are inaudible. Not used for such applications filters on the audio stack of the operating system Also, use can be made of detection equipment in order to be able to recognize. Dsp signals

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