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Anonymous Query Processing in Road Networks
Abstract
The increasing availability of location-aware mobile devices has given rise to a flurry of
location-based services (LBS). Due to the nature of spatial queries, an LBS needs the user
position in order to process her requests. On the other hand, revealing exact user locations to a
(potentially untrusted) LBS may pinpoint their identities and breach their privacy. To address
this issue, spatial anonymity techniques obfuscate user locations, forwarding to the LBS a
sufficiently large region instead. Existing methods explicitly target processing in the Euclidean
space, and do not apply when proximity to the users is defined according to network distance
(e.g., driving time through the roads of a city). In this paper, we propose a framework for
anonymous query processing in road networks. We design location obfuscation techniques that
(i) provide anonymous LBS access to the users, and (ii) allow efficient query processing at the
LBS side. Our techniques exploit existing network database infrastructure, requiring no
specialized storage schemes or functionalities. We experimentally compare alternative designs in
real road networks and demonstrate the effectiveness of our techniques.
Existing System
The increasing availability of location-aware mobile devices has given rise to a flurry of
location-based services (LBS). Due to the nature of spatial queries, an LBS needs the user
position in order to process her requests. On the other hand, revealing exact user locations to a
(potentially untrusted) LBS may pinpoint their identities and breach their privacy. To address

2. this issue, spatial anonymity techniques obfuscate user locations, forwarding to the LBS a
sufficiently large region instead. Existing methods explicitly target processing in the Euclidean
space, and do not apply when proximity to the users is defined according to network distance
(e.g., driving time through the roads of a city).
Proposed System
we propose a framework for anonymous query processing in road networks. We design location
obfuscation techniques that (i) provide anonymous LBS access to the users, and (ii) allow
efficient query processing at the LBS side. Our techniques exploit existing network database
infrastructure, requiring no specialized storage schemes or functionalities. We experimentally
compare alternative designs in real road networks and demonstrate the effectiveness of our
techniques.
System Specification
Hardware Requirements:
• System : Pentium IV 2.4 GHz.
• Hard Disk : 40 GB.
• Floppy Drive : 1.44 Mb.
• Monitor : 14’ Colour Monitor.
• Mouse : Optical Mouse.
• Ram : 512 Mb.
Software Requirements:

3. • Operating system : Windows 7.
• Coding Language : ASP.Net with C#