slide1
Download
Skip this Video
Download Presentation
Where’s WikiLeaks ?

Loading in 2 Seconds...

play fullscreen
1 / 25

Where’s WikiLeaks ? - PowerPoint PPT Presentation


  • 101 Views
  • Uploaded on

Where’s WikiLeaks ?. GEOLOCATION SERVICE. A Model Based Active Geolocation Service. S. Laki* , P. Mátray , P. Hága, T. Sebők, I. Csabai, G. Vattay. Spotter :. Sándor Laki* Eötvös Loránd University Budapest, Hungary [email protected]

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Where’s WikiLeaks ?' - glynis


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
s laki p m tray p h ga t seb k i csabai g vattay
GEOLOCATION SERVICE
  • A Model Based ActiveGeolocation Service

S. Laki*, P. Mátray, P. Hága, T. Sebők, I. Csabai, G. Vattay

Spotter:

Sándor Laki*

Eötvös Loránd University

Budapest, Hungary

[email protected]

  • The Project was supported by the European Union and co-financed by the European Social Fund (grant agreement no. TAMOP 4.2.1./B-09/1/KMR-2010-0003).
motivation
Motivation
  • Location information can be useful for both private and corporate users
    • Targeted advertising on the web
    • Restricted content delivery
    • Location-based security check
  • Scientific applications
    • Measurement visualization
    • Network diagnostics
    • Analysing spatial properties
    • of the Intenet
ip geolocation in general
IP Geolocationingeneral

PassiveGeolocation

ActiveGeolocation

  • Geolinguistic
  • Registrybased
    • Whois, dns
    • Organizationalinfromation
  • Commercial databases
    • Maxmind, IPLigence, IP2Location, etc.

rt1.lon.uk.geant2.net

London, UK

ip geolocation in general1
IP Geolocationingeneral

PassiveGeolocation

ActiveGeolocation

  • Geolinguistic
  • Registrybased
    • Whois, dns
    • Organizationalinfromation
  • Commercial databases
    • Maxmind, IPLigence, IP2Location, etc.

rt1.lon.uk.geant2.net

Large and geographicallydispersed IP blockscan be allocatedto a singleentity

ip geolocation in general2
IP Geolocationingeneral

PassiveGeolocation

ActiveGeolocation

Activeprobing

Delay, topology, etc.

Landmarks

Withknownlocation

Locationestimatesforeachindividual IP addresses

  • Geolinguistic
  • Registrybased
    • Whois, dns
    • Organizationalinfromation
  • Commercial databases
    • Maxmind, IPLigence, IP2Location, etc.

rt1.lon.uk.geant2.net

Large and geographicallydispersed IP blockscan be allocatedto a singleentity

active geolocation
Activegeolocation

?

Target

to be localized

active geolocation1
Activegeolocation

Landmarkswithknownlocation

active geolocation2
Activegeolocation

1010 ms

200 ms

501 ms

898 ms

active geolocation3
Activegeolocation

Transformingdelaystogeographicaldistances

our delay distance model
Ourdelay–distancemodel

Referencedataset

  • Nodeswithknownlocation
  • ~700 PlanetLabnodes
  • Alltoall RTT measurements
    • mininmumdelays
our delay distance model1
Ourdelay-distancemodel
  • Standardizedvalues, fitted normaldistribution
  • Approximatedby a standard normaldistribution
  • Geographicdistancesfollownormaldistribution
    • withparametersµ(t) and (t)for a givendelayt
evaluation
Evaluation

The distances are normally distributed for a given RTT

Foreach RTT theradial profile is approximatedby a normaldistribution (m(d) and s(d))=> which defines the spatial probability distribution of the target

evaluation triangulation
Evaluation – „Triangulation”
  • Landmarks:L1, … , Ln
  • DelaydifromLitoT: Lidi
  • The probabilitythattargetTresidesinregionH:
performance analysis
Performance analysis
  • Estimatedaccuracyfor a geolocationgroundtruth
    • CAIDA’sGeolocationComparisionSurvey
    • More than20000 referencenodes
      • LocatedinNorthAmerica and in Europe

InNorthAmerica

70%

35%

40%

9%

27%

2%

sp o tter the geolocation service
Spotter - The geolocation service
  • online: free, easy to use
    • ~100 landmarks
    • Real timemeasurementsinthebackground
  • offline: batch mode
    • ~50k addresses/day
    • Fulllandmarkset
      • ~700 nodes
  • to fix:
    • DNS resolve problem
    • Sequentialqueuing

visit and use!http://spotter.etomic.org

conclusion
Conclusion
  • Spotter is a measurementbasedgeolocation service available online
  • Basedon a probabilisticapproach
    • A noveldescription of delay-distancerelation
  • ValidatedonCAIDA’sGeolocationGroundTruth
    • 30 km and 75 km medianaccuracyinNorthAmerica and in Europe, resp.

New challenges:

    • IPv6, Real timemeasurements, etc
    • The Internet topology and thedelaycharacteristicscould be changedinthefuture
slide25
GEOLOCATION SERVICE

Thankyouforyourattention!

For more infopleasevisit

http://spotter.etomic.org

orsendme an email

[email protected] (Sándor Laki)

ad