3.3 Trojan Programs in Mobile Communication Systems
237
As the plugin SAFE-MAN has two sensors, two state messages will be transmitted.
In the example above, the alarm was activated based on the acoustic signal. The
infrared sensor is not yet active (in passive state).
The Code position contains the entered four-digit “secret” number (0000–9999),
the Bat position—the state of the remaining battery charge (1–6). The Area value
corresponds to the position code (cell identifier), while the Net value informs the user
about the electromagnetic field strength of the network in the message transmission
point.
This example of a message from the SAFE-MAN module contains information
about the condition of the connected equipment (radio commutator switch, etc.).
If the user in the receiver point enters the LST command, the SAFE-MAN module
will silently send a response message and go into the room listening mode (sound
control function) for approximately 45 s.
Let us consider the procedure for position finding with the help of the SAFE-MAN
plugin in detail. One of the great advantages of this plugin is the position finding
feature, which can be useful in case of theft of the tracked device or regular tracking
of a vehicle.
If the location control is switched on, the mobile phone will notify the user about
every change in the position of the control radio cell. This is implemented by means
of automatically transmitting a four-digit hex code indicating the number of the
corresponding cell.
Moreover, it is necessary to remember that identification of every cell is carried
out using its individual scrambling code. At the time of activation, mobile phone of
any user must first determine this code in order to be able to collect the information
about the cell that is necessary to establish radio communication.
As shown in the specific example taken from an actual situation, the data transmission route (i.e., the way between the base station and the terminal device) contained
512 different primary scrambling codes, which in turn were divided into 64 different
groups. Each base station has one primary code and 15 secondary codes associated with it, which helps determine the actual position of the cell. As a rule, it is
recommended to use the Internet to find information about the existing interconnection between the cell identifier and its location. The relevant information is usually
provided by various websites, such as www.nobbi.com.
It should be kept in mind that cells can have different sizes, while the applicant always received only specific information about location of the central cell
point (i.e., the transmitting station). Nevertheless, the data obtained always allow for
quick reconstruction of the approximate route along which the stolen object (or the
monitored vehicle) is moving. The rest, as a rule, is a mere formality.
In general, such plugins can provide extensive measures to ensure security of a
regular user at a pretty reasonable price.
237
As the plugin SAFE-MAN has two sensors, two state messages will be transmitted.
In the example above, the alarm was activated based on the acoustic signal. The
infrared sensor is not yet active (in passive state).
The Code position contains the entered four-digit “secret” number (0000–9999),
the Bat position—the state of the remaining battery charge (1–6). The Area value
corresponds to the position code (cell identifier), while the Net value informs the user
about the electromagnetic field strength of the network in the message transmission
point.
This example of a message from the SAFE-MAN module contains information
about the condition of the connected equipment (radio commutator switch, etc.).
If the user in the receiver point enters the LST command, the SAFE-MAN module
will silently send a response message and go into the room listening mode (sound
control function) for approximately 45 s.
Let us consider the procedure for position finding with the help of the SAFE-MAN
plugin in detail. One of the great advantages of this plugin is the position finding
feature, which can be useful in case of theft of the tracked device or regular tracking
of a vehicle.
If the location control is switched on, the mobile phone will notify the user about
every change in the position of the control radio cell. This is implemented by means
of automatically transmitting a four-digit hex code indicating the number of the
corresponding cell.
Moreover, it is necessary to remember that identification of every cell is carried
out using its individual scrambling code. At the time of activation, mobile phone of
any user must first determine this code in order to be able to collect the information
about the cell that is necessary to establish radio communication.
As shown in the specific example taken from an actual situation, the data transmission route (i.e., the way between the base station and the terminal device) contained
512 different primary scrambling codes, which in turn were divided into 64 different
groups. Each base station has one primary code and 15 secondary codes associated with it, which helps determine the actual position of the cell. As a rule, it is
recommended to use the Internet to find information about the existing interconnection between the cell identifier and its location. The relevant information is usually
provided by various websites, such as www.nobbi.com.
It should be kept in mind that cells can have different sizes, while the applicant always received only specific information about location of the central cell
point (i.e., the transmitting station). Nevertheless, the data obtained always allow for
quick reconstruction of the approximate route along which the stolen object (or the
monitored vehicle) is moving. The rest, as a rule, is a mere formality.
In general, such plugins can provide extensive measures to ensure security of a
regular user at a pretty reasonable price.