German computer scientists have come up with a prototype for building \”covert channels\” between computers using the machines speakers and microphones, potentially defeating high-security measures that rely on placing a so-called \”air gap\” between computers.The scientists said their network was based on a system originally designed for underwater communication.\”We adapt the communication system to implement covert and stealthy communications by utilizing the near ultrasonic frequency range,\” Michael Hanspach and Michael Goetz, of the Fraunhofer Institute for Communication, Information Processing and Ergonomics, wrote in a paper published in the November issue of the Journal of Communications.
via Even Disconnected Computers May Face Cyber Threats : All Tech Considered : NPR.
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