Silent Cascade: Enhancing Location Privacy Without Communication QoS Degradation

  • Leping Huang
  • Hiroshi Yamane
  • Kanta Matsuura
  • Kaoru Sezaki
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3934)


In a wireless communication network, it is possible to locate a user and track its trajectory based on its transmission, during communication with access points. This type of tracking leads to the breach of a user’s location privacy. Prior solutions to this problem enhances user’s location privacy at the expense of communication Quality of Service(QoS) degradation. In this paper, we propose silent cascade to enhance a user’ location privacy by trading users’ delay in silent cascade for anonymity. As a result, it avoids the problem of QoS degradation in prior solutions. Furthermore, we abstract silent cascade as a mix-network based formal model, and use this model to evaluate the performance of silent cascade. Study results prove the effectiveness of silent cascade under different types of QoS requirements. Besides, we also derive the optimal configuration of silent cascade to achieves target anonymity within minimum duration of time. and the theoretical upper bound of a silent cascade’s anonymity.


Mobile Station Silent Period Location Privacy Silent State Silent Ratio 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Leping Huang
    • 1
    • 2
  • Hiroshi Yamane
    • 2
  • Kanta Matsuura
    • 2
  • Kaoru Sezaki
    • 2
  1. 1.Nokia Research Center JapanTokyoJapan
  2. 2.University of TokyoTokyoJapan

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