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You might think that the webcam is the bigger concern, but it turns out that a well-placed microphone is the key to an incredibly clever new hacking technique that sounds like it's straight out of science fiction. Researchers have figured out how to remotely spy on a computer screen by listening in with a microphone.
No, that doesn't make any sense. Screens are made for looking at things... so how, exactly, can someone listen to the electronic images they display?
It's due to a phenomenon called coil whine. Coil whine is typically a high-pitched sound that electronic components produce when they're forced to do a lot of hard work. Old tube-style televisions and monitors were notorious for coil whine, but today's high-tech LCD displays produce it, too.
A team of security researchers discovered that they could listen to coil whine with the help of a well-placed microphone. The raw data the team recorded doesn't look like anything to get worked up about:
Light grey computer monitor with blank grey screen against white background
Protecting yourself against a peeping tom who wants to peer through your webcam is simple enough. Just slap a piece of electrical tape over it when it's not in use. The microphone isn't quite so easy to shield, however... and that could be a very serious problem.
You might think that the webcam is the bigger concern, but it turns out that a well-placed microphone is the key to an incredibly clever new hacking technique that sounds like it's straight out of science fiction. Researchers have figured out how to remotely spy on a computer screen by listening in with a microphone.
No, that doesn't make any sense. Screens are made for looking at things... so how, exactly, can someone listen to the electronic images they display?
It's due to a phenomenon called coil whine. Coil whine is typically a high-pitched sound that electronic components produce when they're forced to do a lot of hard work. Old tube-style televisions and monitors were notorious for coil whine, but today's high-tech LCD displays produce it, too.
A team of security researchers discovered that they could listen to coil whine with the help of a well-placed microphone. The raw data the team recorded doesn't look like anything to get worked up about:
This is what coil whine looks like / Daniel Genkin, Mihir Pattani, Roei Schuster
Daniel Genkin, Mihir Pattani, Roei SchusterThese lines, as Ars Technica reports, merely represent the intensity of a particular pixel on the display. This is just the first stage of the attack, however. A specially-trained machine learning algorithm was able to translate the recordings. With the help of this specialized software tool, the team successfully identified websites that were being displayed with 96.5% accuracy.
It's not likely that hackers will be utilizing a technique like this any time soon. There are much simpler ways out there to snoop on someone's computer activities. Still, the potential is there... and as we continue to fill our homes with smart speakers, connected baby monitors and security cameras equipped with microphones this kind of attack will become all the more appealing to cyber criminals.
Is there a way to listen remotely to a microphone located on a another computer?
I don't want to do a remote desktop connection with sound support, nor to connect to a webcam using some client (Java, Flash, ...). Only the sound should be sent from the remote PC to my local PC?
Any idea for such a tool? It should run on Windows: server side on Windows 7, client side on various Windows (mostly XP).
Have a look at this page on VLC remote
Their program let's you control VLC over a network.
In regular VLC you can go to the File menu, choose Open Capture Device. Under the Direct Show tab, select the Audio Device Name from the drop down menu. Your device should show up in this menu. If not, check your microphone connection or click the Refresh List button.
Also check out this Engadget article on streaming with VLC, there's even a web-interface
You should try Skype.
Add your friends as contacts, then call, video call and instant message with them for free.
Does it have to be connected to another PC? A Bluetooth microphone would work from another room.