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Peer-Based Location of Mobile Devices

Peer-Based Location of Mobile Devices. Mordechai Guri , Anatoly Kesner , Yuval Elovici Ben Gurion University of the Negev, Israel. Concept. Many web services use the user's location as input These services are becoming popular with the rise of smartphone popularity

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Peer-Based Location of Mobile Devices

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  1. Peer-Based Location of Mobile Devices Mordechai Guri, Anatoly Kesner, Yuval Elovici Ben Gurion University of the Negev, Israel

  2. Concept • Many web services use the user's location as input • These services are becoming popular with the rise of smartphone popularity • The services trust the location reported by the user, which can be faked! • Solution: Validatethe user's location using trusted physically-nearby peers(other users) and stationary devices (e.g. Wi-Fi- routers)

  3. Current Scheme Service provider asks for user location User computes location and sends result Service trusts the user's response to indicate the true location

  4. Motivation • Location authentication for area-based coupons • Avoid feeding fabricated data to collective services, confusing traffic report services (e.g. Waze) • Reliable detection of phone/car/child location • A device without GPS capabilities will be able to locate itself using the assistance of nearby peers whose locations are known • In closed places such as buildings, or where GPS signals are blocked, device can utilize the peer-based technique to receive location information

  5. New Scheme

  6. Basic Algorithm • Basic Algorithm • - Service provider (SP) sends location request to client C who asks to be served • - The client then broadcasts location request (L) paired with temporary request code which distinguishes it from other requests from same or other devices, using a wireless interface • - Location request is received by surrounding devices (validators) • - Each validator estimates its own location, and sends the pair <code,location> to the requesting client • - Client calculates its location based on the received pairs and sends it back to the service

  7. Secure Algorithm • Secure algorithm • - Devices Vi register as a validator and receives a unique ID and an encryption key (Dk) • - Client device C broadcasts a validation request containing a code, through short-range communication (e.g. WiFi, Bluetooth) • - Each Vi sends an encrypted response Rcontaining its self-estimated location and a timestamp • - Cpacks all validator responses and sends the package to the service provider • - Service provider decrypts the package, reliably identifies validators, validates their reports and deduces C's location according to them • - Cis now allowed to use the service

  8. Implementation and Technology • Can be applied by: • Google Maps • iTunes • Waze • Foursquare • Much more... • Can use smartphone technologies: • Wi-Fi Direct • Wi-Fi Tethering • Wi-Fi networks: • Through wireless routers • Through wireless access points • Typical range of Bluetooth is too short

  9. Current/Future Work • Implementing the validators on • Routers • Laptops • Portable devices • Wide range of mobile phone • Mathematical Analysis • Distribution Analysis • Security enhancements

  10. Results: Network of devices and sensors, reliably serving as clients and as validators TRUSTED PEER-LOCATION SCHEME

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