Multi-band jammers can cover many radio frequencies

The principle of HF and GSM jamming systems (also called jammers) is to send stronger signals in the same frequency range, so that the original signal between the transmitter and the receiver remains in its original state without flooding the wires, This makes the exchanged frames unusable. An increasingly widely used method that can eliminate certain alarm systems and many peripheral devices via radio waves (GSM transmission, home automation equipment, remote control, WLAN, etc.). So far, such attacks cannot be stopped at all. However, a protection scheme is provided to counteract this situation without preventing Jammer from interfering with the wireless alarm. For example, if we try to block X minutes on 433 or 868 MHz,

If the GSM connection part is also encrypted, the wireless alarm will be sent on another channel (IP, PSTN, 3G, 4G, Sigfox…) and alert the user. If, unfortunately, only one transmission channel is selected and no transmission is possible, the information is only sent during the restoration of the normal state or after the end of the interference attempt. Due to its simplicity, cost-to-time ratio, interference from wireless alarms is the easiest method to achieve. Using multi-band gps jammer can cover many radio frequencies. Fortunately, as we have seen in this section, alarm device manufacturers can provide reliable responses to a large extent, thereby enabling them.

For some wireless alarm systems, it is little known and more covert or undetectable. Software-defined radio “SDR” type attacks (“replay attacks” or “replay attacks” in English) are designed to use SDR transmitters/ The receiver listens to and intercepts the RF radio frequency spectrum from 300 MHz to 928 MHz audio frequency band, and supports ASK, OOK, GFSK, 2-FSK, 4-FSK and MSK modulation. Combined with the software suite, the standard RF signal is decrypted and then “played back” and returned to the alarm system for control. Sources such as “RFCat” can easily feed the RF signal again without the need for complicated equipment. Although this type of attack is less common, it is not recognized as a jamming attempt by the wireless alarm system.

Therefore, users who use the remote control to “disarm” their alarm system (send RF radio signals to the control panel) may be intercepted by the signal and then played for malicious purposes. The user’s deactivation (not allowed) is stored by the alarm center and is regarded as “normal”. “Signal retransmission” attacks are common among our neighbors across the Atlantic, but are still rare in our region (currently). The emergence of available equipment fueled the attack and affected many areas, from home automation to certain automations, alarm systems, car keys, door drivers, etc. A system that does not take countermeasures against such attacks highlights inherent errors, which naturally inherits many connected objects, sensors, alarm systems, etc. Fortunately, many manufacturers of security, home automation, or other products provide particularly effective responses to defend against such attacks. When buying wireless devices, care should be taken to avoid creating real screens at home. It turns out that this variable should also be taken into account when selecting an “anti-jamming” alarm.