1. 1 Wireless Location Privacy Protection Bill Schilit, Intel Research Jason Hong, University of Califonia, Berkeley Marco Gruteser, University of Colorado at Boulder published in IEEE Computer, vol. 36, no. 12, December 2003 2005/011/21 Presented by Hojin Lee

2. 2 Contents Introduction Privacy risks Economic damages Location-based spam Harm to a reputation Protecting privacy Intermittent connectivity Network privacy Conclusion

3. 3 Introduction Location-based services are emerging as the next killer app dialing 911 by a landline phone in the United States: displays the caller’s phone number and address to dispatcher The US FCC has mandated that, by December 2005, all cellular carriers be able to identify the location of emergency callers There are few safeguards on location privacy The Wireless Privacy Protection Act of 2003: “to require customer consent to the provision of wireless call location information” Commercial entities are adept at concealing questionable practices with fine print in a service contract or click-wrap agreement

4. 4 Privacy Malleable concept based on societal perceptions of risk and benefit Using credit card The challenge with wireless location privacy making it easy share the right information with the right people or service at the right time being able to opt out at will

5. 5 Privacy risks – economic damage Information about a person’s movement or activities can result in financial losses Rental car company fined a customer $450 for speeding after tracking his vans with GPS Rental contract included a warning that speeding would result in additional fees The driver successfully sued the company for failing to adequately explain how it used the location-tracking system

6. 6 Privacy risks – location-based spam Discover and match a person’s location trail to create unwelcome spam Cybermarketers could bombard a mobile device with customized voice and data ads, as an individual strolls through a mall Buy and sell location traces

7. 7 Privacy risks – harm to a reputation Disclosure to location information may cause embarrassment or humiliation By exposing a diet doctor’s tendency to frequent fast-food restaurant Such revelations can lead to tragic consequences including resignation, ostracism, or even suicide, …

8. 8 Protecting privacy Positioning systems Network-based Network-assisted Client-based fundamentally better than networks-based or network-assisted tracking

9. 9 Protecting privacy – intermittent connectivity Operating while disconnected avoid revealing precise location information by retrieving geographically coded records one set at a time rather than individually through separate queries

10. 10 Protecting privacy – networks privacy Wi-Fi wireless networks and hotspots are based on the Internet protocol TraceRoute – expose packet routes and therefore source location => Mobile IP: fixed home agent

11. 11 Conclusion Wireless location-based services are the next killer app We should consider wireless location privacy! economic damage, location-based spam, harm to reputation, …