Israeli research has found that reading the blinking light of a light can capture secrets in the computer

The host of a desktop computer usually has a LED (LED) indicator, which is in command, input, or read through a flashing display. But can you imagine the faint flicker or the possibility of revealing a lot of secrets?

According to Russia today television website reported that 23 people of Israel Ben Gurion University found that the hacker lights flicker frequency can be obtained through the interpretation of LED, and the network physical isolation computer in secret.

Physically isolated computers can be said to be safer computers because they are neither connected to the outside world nor connected to the network of companies or organizations. However, if someone connects a mobile hard disk or other storage device that carries the virus software to the computer, the virus in the storage device will control the flashing of the LED indicator. By flashing, the LED light sends out binary signals, which transmit information. The speed of a scintillation signal is as fast as 4000 bits per second.

An inductive Mini drone flies outside of the computer's room, recording the flash of the LED indicator, and then hackers can decipher secret information such as passwords and encryption keys that are included in the computer.

Sometimes hackers don't have to send drones at all. They can invade the closed-circuit monitoring system of an institution and collect and interpret the flashing mode and frequency of the LED indicator directly through the surveillance camera.

Mordecai Guri, head of the research and development division at the University of Gurion network security research center, was involved in the study. "This computer intrusion is very secretive," he said in an interview with the American online magazine wired. Because if a computer is infected with a virus, no one will notice the way the LED indicator blinks."

Although the approach to computer hacking is difficult to detect, the approach to it is simple. The researchers suggest that computer users can use an opaque adhesive tape to stick to the LED indicator, or to disconnect it from the computer directly, so as to prevent LED lights from leaking out to hackers.

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