Session 21 Amzb Mobile Phones

Week 21

MEDIA AND STORAGE

Today  Pop

Quiz’s marks

MOBILE PHONES INTELLIGENCE GATHERING PART ONE

So Phone’s  Cell

sites  The handset  The SIM card

What makes them work Text messages Calls

○ SMS ○ MMS

Multimedia

Full-duplex vs. halfduplex

What is full and half Is aDuplex? cell phone Channels half or full duplex



 CB radio has 40 channels. A typical cell phone can

communicate on 1,664 channels or more!



Range  Walkie talkie about 1 mile (using .25 watt transmitter)  CB radio about 5 miles (using a 5 watt transmitter)  Cell phones use cells which can give global coverage

Cell site towers

Cell’s and cell site How cells are mapped

 The

cell site is a location or a point, the cell is a wide geographical area.

Cell site Passing

How it works

Triangulation 

We need 3 volunteers Length of string ○ The longer the string the weaker the signal and therefore the great the distant ○ Would any one like to guess where the mobile

phone is ?



Becoming commonly know as Virtual GPS Has good and bad issue attached ○ Can you think of any?

location

Further Study  Soham

murders

Ian Huntley's conviction for the murder of

Holly Wells and Jessica Chapman was based partly on crucial mobile phone evidence

Mobile phone details 

Electronic Serial Number a unique 32-bit number programmed into the

phone when it is



Mobile Identification Number / International Mobile Equipment Identity a 10-digit number derived from your phone's

number 

System Identification Code a unique 5-digit number that is assigned to each

carrier by the FCC

What can they tell us

CALLS

Communications  Who

to  When  How long for How can we use this and why is it important

Times  When

was the phone used  Where was the phone at time  When did the phone get turned off last Helping us develop a time line

The social network  Who

do they know

This can give us leads

for further enquiry. Given times and locations for the caller and the receiving handset we can map locations for known individuals

What can you read from them

TEXT MESSAGE

Text messages  Think

of text messages as small emails

Details of events that are due to happen or

have occurred People names Just plan information

For example -“ I cant believe what I did to sally in the pub last night”

images  Images

can be very helpful to an investigator.

Case study 

Miss Begg Newcastle airport slipway crash  Car crash reported at 12:08 via mobile phone  Units turned up while Miss x was still on the phone  Miss Begg said she had rung her mum when she had the crash then rang the police ○ (this is quite common shock etc)  Statement had ○ She tried to brake but the car fail to stop and she hit the car stop at the

side of the slip road ○ Miss Begg left Mr y’s house at 11:53 approximately 10miles away ○ Miss Begg said she had pulled over to take a called about 10 minutes earlier ○ Then the next time she used the phone was to call her mum then the 999 call

Case study  During

the investigation

Person check ○ Drugs and drink nil found Vehicular check ○ No faults found Environmental check ○ No faults found ○ This included weather road surface and lighting etc

Case study  Some

problems with this case

Officers failed to take the phone when they

arrived on the scene. Miss Begg had made several more calls after the officer arrived at the scene

Case Study 

  



The Prosecutor told the court of police analysis of the calls He said: "Telephone records show the cause was simple and undeniable. As she was travelling north on the dual carriageway at about 65 to 70mph she was sending text messages. "Her eyes can't have been on the road ahead. Having sent the last message, she realised she was horribly close to Mrs Waites and presumably panicked, overcorrecting her position or maybe breaking and sliding into the car in front. Further analysis shows that in fact almost from the moment of leaving her boyfriend's house she had been in text conversation but nothing untoward had happened until she was in the fastest stretch of her journey.

Case study  

Using the cell site timings Service providers history  It was discovered that ○ Tests on Begg’s mobile phone showed she had used her phone nine times in the journey from Scotswood, Newcastle, to the A696, the scene of the smash. ○ phone records showed Begg used her mobile nine times during the journey, sending or receiving five texts and making or receiving four calls. The final text was to her boyfriend, whose house she had just left.

○ Former bank clerk Begg, 20, of Whinbank, Ponteland, was jailed for

four years, but that was reduced to three years on appeal.

 The offences carry custodial sentences of up to five years for causing death by careless

driving and up to two years for causing death by driving while unlicensed, disqualified or uninsured.

Intro for next session

3G HANDSET

Some thing for next time  3G

handsets are now more like:

○ PDA ○ Digital cameras ○ Mobile internet ○ GPS (satellite navigation) ○ Mp3 players ○ Portable storage devices

 

http://blog.teamgearedup.com/2006/01/how-to-triangulate-a-mobile-phone-location.html http://www.synergyforensic.co.uk/news_item.asp?article=84

That all folks 

Thanks for listening Presented by

Part two coming soon

Martin Zeus Brown Music ○ Banana Phone by Raffia Volunteer 1 by UOT student Volunteer 2 by UOT student Volunteer 3 by UOT student

Arron