http://news.cnet.com/8301-1009_3-57614442-83/malware-jumps-air-gap-between-non-networked-devices/
Computer scientists have developed malware capable of establishing communications between devices that don’t have active network connections. The discovery threatens the perceived protection of the “air gap” that separates standalone devices.
Using the built-in microphones and speakers found on PCs, the lab-created prototype malware uses inaudible audio signals to transmit small amounts of data over covert channels at distances of nearly 65 feet. The distance can be increased by creating a network of devices that repeat the signals.
The proof-of-concept software, detailed in the Journal of Communications, suggests that a lack of an Internet connection isn’t enough to insulate sensitive internal computer systems from the outside world. The research comes after the recent disclosure of mysterious malware that used high-frequency signals to hurdle between non-networked devices.
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