Israeli study found that the interpretation of the blinking lights can get the secret of the computer

The host of the desktop computer usually has a light emitting diode (LED) indicator, which indicates that the computer is in command of the input or read by flashing. However, can you imagine that this faint flicker can also reveal a lot of secrets?

According to Russia today television website 23 reported that Israel - Gurion University researchers found that hackers through the interpretation of the LED indicator flashing frequency, can be obtained with the network physical isolation of the computer in the confidential.

Physical isolation of the computer can be said to be a relatively safe computer, because it is not connected with the outside world, nor with the company or the internal network. However, if someone has a mobile hard disk or other storage device connected to the computer with the virus software, the virus in the storage device will control the flashing of the LED indicator. Through the flash out, the LED lamp can send out a binary signal, thus passing out the message. The fastest transmission speed of up to 4000 bits per second.

An induction device micro UAV flew to the window of the computer room, recording the flashing lights of the LED indicator, and then, the hacker will be able to decipher the password, encryption key and other confidential information contained in the computer.

Sometimes, hackers do not need to send drones. They can invade a closed circuit monitoring system, through the monitoring camera directly on the LED indicator flashes and frequency of collection and interpretation.

Mordecai Guri, director of research and Development Department of network security research center at the University of. He said in an interview with the American Journal of online magazine, "this is a very subtle way to hack into a computer. Because if a computer is infected with a virus, no one will notice that the LED indicator flashes in a different way. "

Although this method of computer intrusion is hard to detect, the way to deal with it is simple. The researchers suggested that users of the computer can be used opaque adhesive tape glued to the LED indicator, or directly connected to the computer and it, so as not to prevent the LED indicator leaked to hackers.

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