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3 Hardware Trojans in Electronic Devices
Based on the time of passing of waves, the distance between a mobile phone and
a base station can be determined at any moment with a precision of up to 10–20 m!
After that, the distances between base stations and the mobile phone are applied to
the map. The point of intersection of these lines will indicate the current position of
the mobile phone.
Even though the described procedure is very reliable, it is also very expensive.
It will not give any useful results if criminal elements will be moving on foot or by
transport. However, in this case, it is possible to use other means of direct tracking of a
mobile phone. Using so-called international mobile equipment identification (IMEI)
equipment or means of IMSI identification, the police can continue the pursuit.
Mobile phones are fitted with a special serial number, which they transmit constantly.
Here, IMSI stands for International mobile subscriber identity. You could say that it
is somewhat like a radiotelephone number of the device.
The use of IMSI identification devices eliminates the dependence on the radiotelephone network and its base station. These devices provide direct monitoring of the
mobile phone. Since phone number (IMSI) and serial number (IMEI) are stored
inside the phone, it allows controlling it directly. In this case, however, it is necessary to have at least approximate information about movements of the mobile phone.
Based on this information, a properly equipped vehicle is used, which is transported
to the required district for direct control over phone conversations.
Even if an offender changes the mobile phone (IMEI) or installs another SIM card
(IMSI change), his position will still be requested and identified. The pursuit will
only hit a dead end if the criminal undertakes both of the above actions.
3 Hardware Trojans in Electronic Devices
Based on the time of passing of waves, the distance between a mobile phone and
a base station can be determined at any moment with a precision of up to 10–20 m!
After that, the distances between base stations and the mobile phone are applied to
the map. The point of intersection of these lines will indicate the current position of
the mobile phone.
Even though the described procedure is very reliable, it is also very expensive.
It will not give any useful results if criminal elements will be moving on foot or by
transport. However, in this case, it is possible to use other means of direct tracking of a
mobile phone. Using so-called international mobile equipment identification (IMEI)
equipment or means of IMSI identification, the police can continue the pursuit.
Mobile phones are fitted with a special serial number, which they transmit constantly.
Here, IMSI stands for International mobile subscriber identity. You could say that it
is somewhat like a radiotelephone number of the device.
The use of IMSI identification devices eliminates the dependence on the radiotelephone network and its base station. These devices provide direct monitoring of the
mobile phone. Since phone number (IMSI) and serial number (IMEI) are stored
inside the phone, it allows controlling it directly. In this case, however, it is necessary to have at least approximate information about movements of the mobile phone.
Based on this information, a properly equipped vehicle is used, which is transported
to the required district for direct control over phone conversations.
Even if an offender changes the mobile phone (IMEI) or installs another SIM card
(IMSI change), his position will still be requested and identified. The pursuit will
only hit a dead end if the criminal undertakes both of the above actions.