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Cyber attacks targeting computers are advancing with technology. Nowadays, some methods of stealing data without a physical connection to a computer that is not connected to the network have appeared. For example, a method of using electromagnetic waves leaking from a monitor called Tempest is relatively well known.
Researchers at Israel’s Cyber Security Labs have unveiled a new way to steal data without connecting to a target device. Transmitting data using delicate display contrast differences that humans cannot recognize.
This technology modulates the necessary data to 0 and 1 by slightly manipulating the RGB values of the LCD display. The display is photographed with a camera from the outside and data is demodulated based on the image contrast. It is said that the change in screen brightness is very small and the changeover is fast, so it cannot be recognized with the naked eye.
Receiving data for this technique requires a camera at a location that is visible on the screen. However, if you have a low-security surveillance camera or webcam that can be accessed from outside, you can hack it and get data without having to directly access the target computer.
However, in reality, the possibility of being attacked is quite low. This is because, as a prerequisite, it is necessary to prepare for transmission by executing a transmission program by any method such as infecting a malicious code on the terminal that wants to steal data. Originally, if you just don’t notice a malware infection, it can be much faster to just find the data over the network. Anyway, using this technique can have the advantage of being difficult to track.
This method can steal data if there is a malware infection or a camera to shoot the display in advance. As the prerequisites are so strict, it is unlikely that they will be used in practice, but it may be better to consider the camera location in the future for terminals handling high-level confidential information. Related information can be found here .
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