Some train operators need to use GSM-R SIM cards to ensure that the train is connected to the control center. Although most GSM-R SIM cards use encryption, hackers can use GSM jammers to block the communication channel between the train and the control center. The GSM signal blocker can prevent the mobile phone from receiving signals from the base station normally. Although the use of GSM jammers is prohibited in most areas of the world, such devices can still be easily purchased through online channels. GSM jammers are mainly used in schools (to prevent students from cheating in examination rooms), prisons (to prevent prisoners and visitors from communicating illegally) and movie theaters (to prevent telephone ringing from interfering with watching movies), etc. According to safety researchers, trains within the European Train Control System (ETCS) will automatically stop when the communication link with the control center is interrupted. Therefore, by using a GSM jammer, hackers can force a train to stop.
Another big problem related to GSM-R SIM cards is that users often rarely change their default PIN code, which is 1234. 1234 is currently the most widely used default PIN code, and the second most popular PIN codes are 1111 and 0000. . Hackers can easily guess the content of the PIN code and use this to access the train or control center. In order to avoid such information security attacks, users of GSM-R SIM cards should use random PIN codes as soon as possible. In addition, using a 6-digit PIN code is much safer than a 4-digit PIN code.
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