The sniffer is basically a transceiver that works in the frequency which is in the special unused range that is operated by the service provider or at a frequency that is much different than the one that is being used. For the detection of lost mobile SNIFFER plays a vital role . The sniffer device has to be designed precisely and size should be reduced for easy mobility for the purpose of detection .

1. Methodist College Of Engineering And
Technology
Department Of Computer Science & Technology
Seminar on
“Sniffer For Detecting Lost Mobiles”
By
Sumaiya Arjumand
160710733055
CSE(IV Year)

2. CONTENTS
• What is a sniffer ?
• What is IMEI?
• Designing of the sniffer
 Sniffer base station
 Unidirectional Antenna
 Tracking software
• Working of sniffer device
• Advantages
• Limitations
• References

3. What Happens when you lose your
Mobile Phone?

4. Searching… Reporting… Praying…

5. What is the best Solution then?

6. Sniffer

7. What is a Sniffer?
• The sniffer is basically a transceiver that works in the frequency
which is in the special unused range that is operated by the service
provider or at a frequency that is much different than the one that is
being used.
• For the detection of lost mobile SNIFFER plays a vital role .
• The sniffer device has to be designed precisely and size should be
reduced for easy mobility for the purpose of detection .

8. What Sniffer actually has?

9. What Sniffer actually
has?
Small Base Station
Plays major role
Includes:
Transceiver section
operated at frequency (different)
Directional
antenna

10. What is IMEI?
(International Mobile Equipment
Identifier)

11. What is IMEI?
I n t e r n a t i o n a l M o b i l e E q u i p m e n t I d e n t i f i e r
• Each mobile device has a globally unique IMEI
• 15 digit unique code
• identify-GSM/DCS/PCS phone
• IMEI number is transmitted and checked against a data base of black listed or grey
listed phones in the network’s EIR (Equipment ID Register), if match found then the
network can perform different actions.
• Used for blocking of call made by unauthorized person once the mobile is reported
as stolen

12. What is IMEI?
I n t e r n a t i o n a l M o b i l e E q u i p m e n t I d e n t i f i e r
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

13. 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 EIR match

14. Designing of the Sniffer
The sniffer device can be called as a mobile base station
that includes the following important components:
• Sniffer base station
• Unidirectional antenna
• Tracking software

15. Designing of the Sniffer
The sniffer device can be called as a mobile base station
that includes the following important components:
• Sniffer base station
• Unidirectional antenna
• Tracking software

16. 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)

17. 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)

18. 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

19. S/W for the Tracking
Designing for the Sniffer - S/W for the Tracking
RAM
IMEI Number
Lost mobile
Signaling information
i/p

20. Working of a Sniffer Device
• Sniffer works as a transceiver
• BTS (Base Transceiver Station) - Act as a middle
man
• MTSO (Mobile Telephone Switching office) =
MSC(Mobile Switching Centre)

21. Working of the Sniffer
The entire working of the sniffer is categorized
in two phases :
• Before Sniffer increases the frequency
• After Sniffer increases the frequency

22. Before Sniffer Increase The Frequency

23. After Sniffer Increase The Frequency
Fig: The lost mobile phone connection establishes a
connection with the sniffer

24. Sniffer tries to Communicate with the
Lost Mobile

25. Advantages
• Useful in detection of lost mobile on a large
scale
• Overall effective cost of the design and the
detection is low
• Low power consumption

26. Limitations
Certain boundaries :
• Power of the mobile should be good enough
• Mobile should not been in shadow region
Note: “Method can been improved by using modern technology and devices”

27. References
•Schiller, “Mobile Communication”, Pearson Education 1
Edition, 7th reprint -2003.
•R. S. Satya Sri Ambica, P. Padma Priya, Dr.N.Srinivasu,
“Sniffer Technology to Detect Lost Mobile ”, International
Journal of Engineering Trends & Technology, volume
4,issue4 –April 2013.
• Puthiyavan,U., “Enhancing User Privacy- Location Based
Search Using MEMD” , IEEE International Conference on
Portable Information Devices 2007, May 2007, Pp-1-5.

28. Thank You