Leveraging P2P interactions for efficient location privacy in database-driven dynamic spectrum access

Erald Troja, Spiridon Bakiras

Research output: Contribution to journalArticle

1 Citation (Scopus)


Dynamic spectrum access (DSA) is a novel communication paradigm that enables wireless clients to utilize statically allocated radio channels that are currently idle. Specifically, in the database-driven DSA model, clients learn their geographic location through a GPS device and use this location to retrieve a list of available channels from a centralized white-space database. To mitigate the potential privacy threats associated with location-based queries, existing work has proposed the use of private information retrieval (PIR) protocols when querying the database. Nevertheless, PIR protocols are very expensive and may lead to significant costs for highly mobile clients. In this paper, we propose a novel method that allows wireless users to collaborate in a peer-to-peer (P2P) manner, in order to share their cached channel availability information that is obtained from previous queries. To preserve location privacy against other users, we leverage an anonymous veto protocol that anonymizes the exchange of information among a group of users. Our experimental results with a real-life dataset show that our methods reduce the number of PIR queries by 50% to 60%, while incurring low computational and communication costs.

Original languageEnglish
Pages (from-to)569-579
Number of pages11
JournalInternational Journal of Network Security
Issue number5
Publication statusPublished - 2015
Externally publishedYes



  • Computer-communications networks
  • Database applications
  • Database management
  • Distributed systems
  • GIS
  • Spatial databases

ASJC Scopus subject areas

  • Computer Networks and Communications

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