In some cases, the use of mobile phones can cause strong interference and even disgusting to us. For example, when a performance is being enjoyed in a theater, a sudden strong mobile phone alarm in front of us can be very annoying. Even in some military bases, including government prisons, radio frequency interference is prevented by installing a wifi jammer, effectively preventing prisoners from using hidden phones for certain illegal transactions or activities.
Recently, computer scientists at the Technical University of Berlin have successfully changed their mobile phones into simple wifi jammers by changing a part of the software inside the mobile phone. They used the loopholes in the GSM radio band standard and in mid-August. Their findings were presented by computer scientists at the 22nd Usenix Security Symposium in Washington.
Their modified and optimized mobile phone software can effectively deceive the radio transmitter. In the range of interference, it is more widely intercepted than the professional wifi jammers we often use, instead of being limited to the jamming radius of a few meters to tens of meters of mobile phone jammers, the revised mobile phone can block SMS and the entire area. The reception of the phone, in the worst case, may even intercept the message.
In Berlin, for example, in their research, only a few mobile phones can intercept a small number of networks with smaller providers. Nico Golde explained that this could affect the entire community and block the mobile network coverage of all mobile phones in a certain region. However, after the software is replaced, even text messages can be intercepted and read due to cracked encryption and lack of authentication.
wifi jammer is very common in the market. Generally, they can only form a blockage within a radius of a few meters. It is difficult to detect a phone several kilometers away. At the same time, with the development of interference technology, most mobile phone jammers are not limited to single interference band, some can even intercept mobile phones, GPS WiFi radio signals, powerful. However, if the operation is not proper, there will be security risks, such as affecting the emergency call, so the user should pay attention to the scope of use, and should not be used for illegal purposes.