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SUMMARY:A spatial cloaking framework based on range search for nearest nei
 ghbor search - Hyoungschick Kim\, University of Cambridge
DTSTART:20090918T150000Z
DTEND:20090918T153000Z
UID:TALK20069@talks.cam.ac.uk
CONTACT:Joseph Bonneau
DESCRIPTION:For nearest neighbor search\, a user queries a server for near
 by points of interest (POIs) with his/her location information. Our aim is
  to protect the user's sensitive information against adversaries including
  the location-based service itself. Most research efforts have elaborated 
 on reasonable trade-offs between privacy and utility. We propose a framewo
 rk based on range search query without a trusted middleware. We design a q
 uery processing algorithm for the minimum set of candidate POIs by computi
 ng the local Voronoi diagram relevant to the cloaked region. Contrary to c
 ommon belief that cloaking approaches using range search incur expensive p
 rocessing and communication cost\, experimental results show that the fram
 ework incurs reasonable processing and communication overhead even for lar
 ge cloaked regions.
LOCATION:Computer Laboratory\, William Gates Building\, Room FW11
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