"With appropriate software, compatible radio signals can be produced by a compromised computer, utilizing the electromagnetic radiation associated with the video display adapter," the researchers write. The victim's own mobile phone can be used to receive and transmit the stolen data, or an attacker lurking outside an office or lab can use his own phone to pick up the transmission. The data can be picked up by a mobile phone up to 23 feet away and then transmitted over Wi-Fi or a cellular network to an attacker's command-and-control server. This method is very effective for transmitting short textual massages such as identifiers, key-stroking, keep-alive messages and notifications." "Using less than 40 distinct audio frequencies, we were able to encode simple textual data-both alphabetical and numerical. "ach letter or character was keyed with different audio frequency," they note in a paper released last week (.pdf) that describes their technique. But the exact technique for doing this has never been revealed. The spy agency has reportedly used the method in China, Russia and even Iran. An NSA catalogue of spy tools leaked online last year describes systems that use radio frequency signals to remotely siphon data from air-gapped machines using transceivers-a combination receiver and transmitter-attached to or embedded in the computer instead of a mobile phone. The attack recalls a method the NSA has been secretly using for at least six years to siphon data in a similar manner. All of this is done to keep important data out of the hands of remote hackers.īut these security measures may be futile in the face of a new technique researchers in Israel have developed for stealthily extracting sensitive data from isolated machines-using radio frequency signals and a mobile phone. Sometimes, workers are not even allowed to bring mobile phones within range of the computers.
#SOUND SIPHON PREVENT SYSTEM SLEEP BLUETOOTH#
They're also not connected to other systems that are internet-connected, and their Bluetooth feature is disabled, too. Computers housing the world's most sensitive data are usually "air-gapped" or isolated from the internet.
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