Department Of Computer Science & TechnologySeminar on

“Sniffer For Detecting Lost Mobiles”

Methodist College Of Engineering And Technology

BySumaiya Arjumand160710733055CSE(IV Year)

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

What Happens when you lose your Mobile Phone?

Reporting…Searching

…Praying…

What is the best Solution then?

Sniffer

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 .

What Sniffer actually has?

What Sniffer actually has?

Small Base Station

Plays major role

Transceiver section

operated at frequency (different)

Directional antenna

Includes:

What is IMEI?(International Mobile Equipment

Identifier)

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

• Each mobile device has a globally unique IMEI

• Used for blocking of call made by unauthorized person once the mobile is reported as stolen

• 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.

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

If EIR & IMEI matched

NETWORKS CAN DO NO. OF THINGS

TO KNOW IMEI NUMBER DIAL *#06#

BUT, We use IMEI EFFECTIVELY in SNIFFERFor the purpose of DETECTON

Gray ListAllow the Phone to be used, but can be tracked to see who has it.

Black ListListing the phone from being used on any number where there is an EIR match

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

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

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)

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)

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

IMEI Number

Lost mobile

Signaling information

Programming done-c/java

Front end-VB

Back end- oracle SQL

i/p

checks

s/w got

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)

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

Before Sniffer Increase The Frequency

After Sniffer Increase The Frequency

Fig: The lost mobile phone connection establishes a connection with the sniffer

Sniffer tries to Communicate with the Lost Mobile

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

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”

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.

Thank You