3.3 Trojan Programs in Mobile Communication Systems
233
Fig. 3.7 With additional
modules (a, b, c), a regular
mobile phone turns into a
multi-purpose alarm and
tapping device
• Always be able to find the mobile phone.
In this example, we will consider standard (commercially available) extension
modules for mobile phones like Siemens—S25–SL45, which are used in case of an
alarm to send an SMS message or to make a call with active tapping function:
SAFE-BOY—acoustic control module (39 × 24 × 15 mm);
SAFE-BAG—geomagnetic field control module (39 × 24 × 15 mm);
SAFE-MAN—thermal control sensor and acoustic control module (71 × 32 ×
14 mm).
All three plugins are installed in the connector of the mobile phone equipped
with embedded fax modem (e.g., Siemens S25–SL45). The voltage is supplied from
this connector to the plugin, due to which the smartphone battery capacity decreases
approximately by 25–30%.
The electronic part of modules is fully based on a popular microcontroller PIC
16C58 (−A and −B); 16C58B is a version of PIC 16C58A. These microcontrollers
are provided with the function of protection of device memory from unauthorized
reading.
This microcontroller is equipped with 12 I/O lines and program memory with a
volume of 2 k ×12 bit, as well as 73 bytes of working memory. It operates at supply
voltage of 2.5 V, while the current consumption in standby mode is only 0.6 µA. The
outputs have a remarkably high load capacity ensuring output current up to 6 MA.
Due to this fact, they can be used to control LEDs, for example.
Execution of programs by the microprocessor is controlled by the watchdog timer,
due to which the device never freezes. All three plugins ensure the possibility of
position evaluation by transmitting numbers of mobile cells.
Let us consider the operating features of all these modules in detail.
233
Fig. 3.7 With additional
modules (a, b, c), a regular
mobile phone turns into a
multi-purpose alarm and
tapping device
• Always be able to find the mobile phone.
In this example, we will consider standard (commercially available) extension
modules for mobile phones like Siemens—S25–SL45, which are used in case of an
alarm to send an SMS message or to make a call with active tapping function:
SAFE-BOY—acoustic control module (39 × 24 × 15 mm);
SAFE-BAG—geomagnetic field control module (39 × 24 × 15 mm);
SAFE-MAN—thermal control sensor and acoustic control module (71 × 32 ×
14 mm).
All three plugins are installed in the connector of the mobile phone equipped
with embedded fax modem (e.g., Siemens S25–SL45). The voltage is supplied from
this connector to the plugin, due to which the smartphone battery capacity decreases
approximately by 25–30%.
The electronic part of modules is fully based on a popular microcontroller PIC
16C58 (−A and −B); 16C58B is a version of PIC 16C58A. These microcontrollers
are provided with the function of protection of device memory from unauthorized
reading.
This microcontroller is equipped with 12 I/O lines and program memory with a
volume of 2 k ×12 bit, as well as 73 bytes of working memory. It operates at supply
voltage of 2.5 V, while the current consumption in standby mode is only 0.6 µA. The
outputs have a remarkably high load capacity ensuring output current up to 6 MA.
Due to this fact, they can be used to control LEDs, for example.
Execution of programs by the microprocessor is controlled by the watchdog timer,
due to which the device never freezes. All three plugins ensure the possibility of
position evaluation by transmitting numbers of mobile cells.
Let us consider the operating features of all these modules in detail.