2022.08.30 Tue 更新

What is a wireless wifi signal jammer?

What is a wireless wifi signal jammer?

Wireless (also known as WiFi) is a great invention that provides the ability to easily access the internet without a physical ethernet connection. This is used by phones and laptops on the go, as well as dozens of devices at home.

However, WiFi—just radio waves at 2.4 Ghz or 5 Ghz—relies on a fairly clear path between the device (like a phone or smart home device) and the receiver (like an internet router). Under normal conditions, walls and buildings reduce signal strength, but you should still be able to use WiFi within 150-300 feet.

However, if there is suddenly a lot of "noise" in an area, there is no longer a clear path. Now it's worth clarifying that I mean a lot of radio noise. Since WiFi is just radio waves, if there is suddenly a lot of extra "traffic" on the 2.4 Ghz and 5 Ghz bands, the wireless signal won't be able to transmit efficiently from the device to the receiver.
This is the nature of wireless jamming devices. They basically "shout" out a lot of (radio) noise, like you're standing behind a radio commentator yelling into their microphone, and anyone listening at home won't be able to understand anything. A detailed January 2021 study by Michigan State University found that Wi-Fi, ZigBee, Bluetooth, and cellular data can all be easily disrupted by various jamming attacks:
It's worth noting that wifi signal jammer attacks are highly illegal and frequently investigated by the FCC, but they are sometimes used by organized crime to help break into property by blocking wireless signals, such as those from "smart" WiFi cameras , so that theft is not recorded.
Therefore, I wanted to write this article to talk more about WiFi jammers. I'm obviously not going to talk about specific jamming devices or how to use/buy them - this post is purely to help you understand the risks and how to avoid them.

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出典 : https://www.behance.net/gallery/150903929/How-to-detect-wifi-jammer?

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