Sniffer
for detecting lost mobile
By
NAVANEETHAN
VIGNESHWARAN
MOHAMED ASHIKALI
What Happens when you lost your
Mobile Phone?
Searching…
Reporting…
Praying…
But still not found?
What is the best Solution then?
What is the best Solution then?
Sniffer
What is Sniffer?
•
•
•
•
•
Precise
Small Size
Mobile Base Station
Unidirectional Antenna
Tracking S/W
What Sniffer actually has?
What Sniffer actually has?
Small Base Station
Includes:
Transceiver section
operated at frequency (different)
Directional antenna
Plays major role
What is IMEI?
(International Mobile Equipment Identifier)
What is IMEI?
International Mobile Equipment Identifier
• Unique number
• Used for blocking of call made by unauthorized person
• 15 digit unique code
• identify-GSM/DCS/PCM
• check EIR
What is IMEI?
International Mobile Equipment Identifier
NETWORKS CAN DO NO. OF THINGS
If EIR & IMEI matched
TO KNOW IMEI NUMBER DIAL *#06#
BUT, We use IMEI EFFECTIVELY in SNIFFER
For the purpose of DETECTON
Gray List
Allow the Phone to be used, but can be tracked
to see who has it.
Black List
Listing the phone from being used on any
number where there is an EMI match
Designing
for
the
Sniffer
1.SNIFFER BASE STATION
2.UNIDIRECTIONAL ANTENNA
3.TRACKING S/W
Design Of Unidirectional Antenna
Designing for the Sniffer - Design Of Unidirectional Antenna
• Act as a eyes for the sniffer
•
Antenna is a device works at specified frequency
•
Transmitting & receiving data signal
• Transmit power
•
Used to show radiation pattern
(Unidirectional Antenna Radio Pattern)
Sniffer Base Station
Designing for the Sniffer - Sniffer Base Station
• Small base station
•
Include transceiver section
• Operated at frequency (900mhz which is VHF range)
• OSCILLATOR circuit-for frequency range
•
Important is cooling
•
Low power transmitter (help in nature)
S/W for the Tracking
Designing for the Sniffer - S/W for the Tracking
• Feature: help to create database using RAM
• IMEA - embedded in a chip
• RAM stores - IMEI no.
• Act as a database
S/W for the Tracking
Designing for the Sniffer - S/W for the Tracking
RAM
Signaling information
IMEI Number
i/p
Lost mobile
Working
of
a
Sniffer
Device
• Sniffer works as a transceiver
The working of sniffers is of two phases:
 Before Sniffer increases the frequency
 After Sniffer increases the frequency
• BTS (Base Transceiver Station) - Act as a middle man
• MTSO (Mobile Telephone Switching office) =
MSC(Mobile Switching Centre)
Before Sniffer Increase The Frequency
• By default Mobile devices always connects to the
BTS(Base Station) and MSC(Mobile Switching Center).
• Now the sniffer increases the frequency and
amplitude.
•
As shown in the figure in the next slide
Before Sniffer Increase The Frequency
After Sniffer Increase The Frequency
• So, only the particular user with the IMEI will be connected to
the particular frequency.
• The other mobile devices of the surroundings will not be
connected.
• As shown in the figure in the next slide
After Sniffer Increase The Frequency
IMEI no. provided by MTSO or MSC
BTS(base transceiver station)-act as a middle man
MTSO(mobile telephone switching office)=MSC(mobile switching centre)
Sniffer tries to Communicate with the Lost Mobile
Is browser sniffing the only viable approach
for mobile device detection?
ADVANTAGES
Useful for lost mobile
•
• effective cost
• low power consumption
• easy to design
The idea of development “Sniffer for the detection of lost Mobile
phones” paves a way by means of which the lost mobile phones can be
recovered.
Conclusion
Certain boundaries :
• Power of mobile should be good enough
• mobile should not been in shadow regain
Note: “Method can been improved by using modern technology and devices”
ANY QURIES…?
Thank You