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Sniffer Technology To Detect Lost MobileSUBMITTED BY

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SEMINAR OVERVIEW Introduction

IMEI

Designing Of Sniffer

Working Of Sniffer Device

Advantages and Disadvantages

Conclusion

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INTRODUCTION The main scope of this paper is to detect the lost mobiles.

By using IMEI (International Mobile Equipment Identity) we can prevent unauthorized person from making and receiving calls.

However there has been no development or very little progress for the detection of the lost mobile phone.

For the detection of lost mobile SNIFFER plays a vital role.

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ABOUT IMEI

Each mobile device has a unique IMEI.

IMEI numbering system is a 15 digit unique code ,used to identify the GSM/DCS/PCS phone.

To know the IMEI number the *#06# has to be pressed.

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If amobile phoneis stolen, the owner can call network provider and instruct them to Blacklist" the phone using its IMEI.

Network provider put the IMEI into Equipment Identity Register (EIR).

When that phone is switched on, this unique IMEI number is transmitted and checked against a data base of black listed phones in the EIR.

If the EIR and IMEI match, the stolen phone cannot access the network.

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DESIGNING OF SNIFFER

Designed precisely. Size should be reduced (for easy mobility). The sniffer device can be called as a mobile base station. Important components: 1. Sniffer base station 2. Unidirectional antenna 3. Software for the tracking

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SNIFFER BASE STATION

Used to maintain the frequency. Sniffer includes transceiver section. It should operate at a frequency that is much different from the frequency of lost mobile. Generate a frequency around 900MHz range(VHF). Cooling is also provided to the circuit. Sniffer uses a low power transmitter. Reduces the interference with other devices.

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UNIDIRECTIONAL ANTENNA The directional antenna has a major role in the design of transmitter.

Antenna is a device which works at specified frequencies range for transmitting or receiving the data signal.

Antennas transmit power depending on lobe pattern.

Lobe pattern varies from one antenna to the other.

The lobe pattern is a two dimensional diagrams that is used to show radiation pattern.

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Radiation pattern of directional antenna The power radiated by the antenna, effective area of the antenna, and effective gain should be properly designed.*

SOFTWARE FOR TRACKING Helps in the process of creation of the data base,using a RAM. RAM stores the IMEI of the lost mobile. Software has the input as the IMEI from the RAM. SQL query fetches the IMEI number from RAM. After getting IMEI number, it checks for getting any signalling information from the lost device that might respond to the signal sent by the sniffer. The programming is done with C or Java. Front end is designed using VB. Oracle SQL is the back end.

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*MS , BTS , BSC , MSC

Mobile Station(MS)MS is made up of two components

1.Mobile Equipment(ME):Each phone is uniquely identified by IMEI.IMEI is burned into the phone by the manufacturer. 2.Subscriber Identity Module (SIM):Each SIM is uniquely identified by IMSI(International Mobile Subscriber Identity).*

Base Transceiver Station (BTS) Responsible for radio communications between the network and the MS. Base Station Controller (BSC) BSC controls multiple BTSs.

Mobile Switching Centre (MSC) MSC handles multiple BSCs. Coordinates with other MSCs.

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WORKING OF SNIFFER DEVICEThe working of sniffer is of two phasesBefore Sniffer increases the frequencyAfter Sniffer increases the frequency

Before Sniffer increases the frequency BTS acts as a middle man in the process of communication between the mobile and the MSC (MTSO).

There is two way communication between devices.

Before the communication establishment, the authentication of SIM card (Using IMSI) and handset (Using IMEI) is done.

The EIR is located at MSC and it contains the IMEI of the lost mobile.

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The initial connection between the cellular network and lost mobile phone*

After Sniffer increases the frequency Information regarding the IMEI of the lost device is fed into the sniffers main memory. The BTS disconnects the connection with the lost mobile phone, as there is a request regarding this action from the EIR part of the MSC. When the sniffer device is being deployed, the lost device finds the sniffer to get itself locked to the frequency of the sniffer. The connection between the sniffer and the mobile phone is established. The IMEI of the lost mobile is validated with the stored IMEI.*

Sniffer communicating

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Searching process can be aided with the GPS system for more accurate and fast detection.

Sniffer is operated in a frequency that is different from the frequency adopted by the cell and nearby ones.

Hence the interference from the nearby cell can be avoided.

The directional antenna is used in finding the location of the mobile phone.

After getting connected with the mobile it creates a virtual cell pattern and thus helps in the detection of lost mobile phones.*

ADVANTAGES Finding thelost mobiles effectively. Cost effective. Low power consumption. Easy to design. DISADVANTAGES Power of the mobile should be good enough.

The mobile phone should not be in the shadow region.

Initial cost is high.

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CONCLUSION In todays life mobile phones are the mainly used device for communication. So large number of complaints regarding the mobile phone that lost are comes. This method appears to be complex , but for large scale detection the overall effective cost of the design down. There are certain boundary conditions. This method can be improved by using modern techniques.*

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